scholarly journals Effect of Rolling Temperature and Subsequence Ageing on the Mechanical Properties and Microstructure Evolution of an Al-Cu-Li Alloy

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 853
Author(s):  
Lin Wang ◽  
Charlie Kong ◽  
Puneet Tandon ◽  
Alexander Pesin ◽  
Denis Pustovoytov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Dislocation Density ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Alloy Sheet ◽  
Low Dislocation Density ◽  
Nucleation Sites ◽  
Density Zone

The mechanical properties and microstructure evolution of an Al-Cu-Li alloy sheet processed via hot rolling (HR) (at 400 °C and 500 °C) or cryorolling (CR) (at −100 °C and −190 °C) and subsequence aging at 160 °C for 10 h were investigated. Before aging, the highest ultimate tensile strength of 502 MPa was achieved when the sheets were cryorolled at −190 °C, while the better ultimate tensile strength of 476 MPa and the best elongation rate of 11.1% was achieved simultaneously when the sheets were cryorolled at −100 °C. The refined grains and numerous uniform deformation-induced dislocations microstructures were responsible for the improved strength and enhanced ductility of the cryorolled sheets compared to that of the alloy processed by hot rolling with a low dislocation density zone (LDDZ) and high dislocation density zone (HDDZ). After aging at 160 °C for 10 h, the ultimate tensile strength further improved resulted from the greater precipitation strengthening, and the increased precipitates provided greater resistance to dislocations movement resulting in the increased ductility although the dislocation density decreased. The uniform dislocation microstructures in the cryorolled sheets provide numerous nucleation sites for the precipitates, leading to higher strength after aging.

Effect of the Rolling Process on Microstructures and Mechanical Properties of the Extruded LA91 Alloy Sheet

2011 ◽  
Vol 686 ◽  
pp. 90-95 ◽  
Author(s):  
Bin Jiang ◽  
Qing Shan Yang ◽  
Liang Gao ◽  
Fu Sheng Pan
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Rolling Reduction ◽  
Thermal Compression ◽  
Cross Rolling ◽  
The Cross ◽  
Rolling Route

The microstructure evolution of the extruded Mg-9Li-1Al (LA91) during rolling was investigated taking account of effects of different routes including hot rolling, and cross rolling. The rolling parameters were suggested by thermal compression testing. As a result, the suggested rolling parameters were 250°C and 1.0s-1. Transverse hot rolling would bring a finer microstructure to the as-rolled LA91 sheet. With the enhancement of the rolling reduction during unidirectional hot rolling the α-Mg phase became granular or short rod-like from long strip-like. Transverse + longitudinal hot rolling would improve the microstructure and was a better cross rolling route by which the strength and the elongation of the cross rolled LA91 sheet reached 243MPa and 20% respectively. The over-aging existed in the cross rolled LA91 sheets.

scholarly journals The microstructure evolution and mechanical properties improvement of the AZ61 alloy by adding Sc

2021 ◽  
Author(s):  
Honggang Zhang ◽  
Jinhui Wang ◽  
Hongbin Ma ◽  
Yuan Yuan ◽  
Yongfeng Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Microstructure Evolution ◽  
Secondary Phase ◽  
Grain Sizes ◽  
Az61 Alloy ◽  
Mg17al12 Phase

Abstract The improvement of mechanical properties and the microstructure evolution through adding Sc to AZ61magnesium alloy were studied. The results indicated that the Mg17Al12 phase in the extruded AZ61 alloy was mainly distributed around the sub-structured and fine deformed grains, resulting in the nonuniform microstructure. The addition of Sc could effectively suppress the band-like precipitation of Mg17Al12 phase and improve the uniformity of microstructure. The grain sizes of the extruded alloys showed a trend of first decreasing and then increasing with the increase of Sc, which was mainly attributed to the secondary phase. The AZ61-0.5Sc alloy exhibited the best mechanical properties, its ultimate tensile strength and yield strength were 14.8MPa and 40.8MPa higher than those of the extruded AZ61 alloy, respectively, which was ascribed to the fine grains and abundant secondary phase in the alloy.

Microstructure Evolution and Mechanical Properties of Mg-2.5Zn-0.5Y Alloy

2013 ◽  
Vol 380-384 ◽  
pp. 4372-4375
Author(s):  
Li Zhang ◽  
Zheng Liu ◽  
Ping Li Mao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Microstructure Evolution ◽  
Hot Extrusion ◽  
Intermetallic Phases ◽  
Mg Alloy ◽  
Refined Microstructure

The microstructure evolution and mechanical properties of as-extruded Mg-2.5 Zn-0.5Y Mg alloy were investigated. The grainy intermetallic phases (I-phase and w-phase) observed in the as-cast Mg-2.5Zn-0.5Y alloy distributed homogeneously in the hot extruded alloys. Compared with the cast one, the extruded alloy shows predominant mechanical properties as the result of refined microstructure and the dispersed intermetallic phases formed during hot extrusion. The ultimate tensile strength and the yield tensile strength of the extruded alloy were 354.8 MPa and 305.9MPa respectively.

scholarly journals Effect of Al Content on Microstructure Evolution and Mechanical Properties of As-Cast Mg-11Gd-2Y-1Zn Alloy

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7145
Author(s):  
Yuanke Fu ◽  
Liping Wang ◽  
Sicong Zhao ◽  
Yicheng Feng ◽  
Lei Wang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Microstructure Evolution ◽  
Tensile Testing ◽  
Transgranular Fracture ◽  
Lpso Phase ◽  
Al Content ◽  
Al Addition

In the present paper, the Mg-11Gd-2Y-1Zn alloys with different Al addition were fabricated by the gravity permanent mold method. The effect of Al content on microstructure evolution and mechanical properties of as-cast Mg-11Gd-2Y-1Zn alloy was studied by metallographic microscope, scanning electron microscope, XRD and tensile testing. The experimental results showed that the microstructure of as-cast Mg-11Gd-2Y-1Zn alloy consisted of α-Mg phase and island-shaped Mg3 (RE, Zn) phase. When Al element was added, Al2RE phase and lamellar Mg12REZn (LPSO) phase were formed in the Mg-11Gd-2Y-1Zn alloy. With increasing Al content, LPSO phase and Mg3 (RE, Zn) phase gradually decreased, while Al2RE phase gradually increased. There were only α-Mg and Al2RE phases in the Mg-11Gd-2Y-1Zn-5Al alloy. With the increase of Al content, the grain size decreased firstly and then increased. When the Al content was 1 wt.%, the grain size of the alloy was the minimum value (28.9 μm). The ultimate tensile strength and elongation increased firstly and then decreased with increasing Al addition. And the fracture mode changed from intergranular fracture to transgranular fracture with increasing addition. When Al addition was 1 wt.%, the maximum ultimate tensile strength reached 225.6 MPa, and the elongation was 7.8%. When the content of Al element was 3 wt.%, the maximum elongation reached 10.2% and the ultimate tensile strength was 207.7 MPa.

Microstructure and Formability of Different-Speeds Rolled AZ31 Mg Sheet

2007 ◽  
Vol 544-545 ◽  
pp. 407-410 ◽  
Author(s):  
Jae Seol Lee ◽  
Hyeon Taek Son ◽  
Young Kyun Kim ◽  
Ik Hyun Oh ◽  
Chang Seog Kang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Grain Boundary ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Potential Application ◽  
Plastic Anisotropy ◽  
Mg Alloys ◽  
Az31 Mg Alloy

The aims of this study ares to investigate the microstructure evolution of AZ31 Mg alloys with normal rolling and different speeds rolling during hot rolling affects microstructure, texture and mechanical properties of AZ31 Mg alloy. In the microstructures of as-rolled both samples, twins are clearly apparent, small and recrystallized grains are visible along some grain boundary and twinned regions. The tensile strength and yield strength of DSR sample were slightly higher than that of NR sample. Also, in the case of the NR sample, tensile strength indicated different values to the rolling directions. From this result, NR sample compared to DSR sample strongly indicated to the plastic anisotropy tendency. Therefore, it is noted that DSR sample could be presented to the good formability, comparing to the NR sample. DSR samples deformed at 473K and 523K could be perfectly formed, indicating the potential application of the DSR process to improve formability of the Mg alloys at warm temperatures.

Microstructure and Mechanical Properties of As-Rolled Mg-Zn-Gd-Ca-Mn Sheets

2014 ◽  
Vol 788 ◽  
pp. 68-73
Author(s):  
Sheng Shuan Dongye ◽  
Hong Yan ◽  
Xing Hao Du ◽  
Rong Shi Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Ultimate Tensile Strength ◽  
Ambient Temperature ◽  
Hot Rolling ◽  
Basal Texture ◽  
Microstructure And Mechanical Properties ◽  
Zn Concentration ◽  
Elongation To Failure

The Mg-(4,6)Zn-1Ca-1RE-0.5Mn magnesium alloy sheets were processed by hot rolling, and the effect of Zn concentration on the microstructure and mechanical properties was investigated using OM,SEM and XRD technique. The Mg-4Zn-1Ca-1RE-0.5Mn sheet exhibits excellent tensile properties at ambient temperature with ultimate tensile strength of 332MPa and elongation to failure of 4.5%. The notable mechanical properties were attributed to fine DRX grains and large deformed grains with intense basal texture.

Effect of ECAP Prior to Aging on Microstructure, Precipitation Behaviour and Mechanical Properties of an Al-Cu-Mg Alloy

2018 ◽  
Vol 385 ◽  
pp. 290-295 ◽  
Author(s):  
Ivan Zuiko ◽  
Marat Gazizov ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Microstructure Evolution ◽  
Thermomechanical Processing ◽  
High Strength ◽  
Mg Alloy ◽  
Angular Pressing ◽  
Precipitation Behaviour ◽  
Peak Aged

Microstructure, precipitation behaviour and mechanical properties of an Al-5.64Cu-0.33Mn-0.23Mg-0.14Zr-0.11Ti (in wt. %) alloy subjected to thermomechanical processing (TMP) involving equal-channel angular pressing (ECAP) at ambient temperature to total strains (ε) of ~1 and ~2 followed by aging at 180°C for 0-28 h have been investigated and compared with conventional aging at the same temperature (T6 state). TMP led to significant increase in yield stress (YS) and ultimate tensile strength (UTS) and decrease in elongation-to-fracture as compared to the peak-aged T6 state. The YS, UTS and δ values attained after ECAP to ε ~ 2 followed by peak ageing were ~510 MPa, ~540 MPa and ~7.6%, respectively. The changes in mechanical properties were related to microstructure evolution and precipitation behaviour. TMP conditions obtaining a high-strength state of the Al-Cu-Mg alloy are discussed.

Microstructure Evolution and Mechanical Properties of Mg-10.37Gd-3.66Y-2.27Zn-0.52Zr Alloy during Reciprocating Upsetting-Extrusion

2021 ◽  
Vol 1035 ◽  
pp. 264-272
Author(s):  
Guo Qin Wu ◽  
Jian Min Yu ◽  
Lei Chen Jia ◽  
Wen Long Xu ◽  
Yong Gang Tian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Microstructure Evolution ◽  
Variable Temperature ◽  
Temperature Deformation ◽  
Dynamic Precipitation ◽  
Strengthening Mechanisms ◽  
Fracture Elongation ◽  
Coarse Grains

The homogenized Mg-10.37Gd-3.66Y-2.27Zn-0.52Zr alloy was subjected to multi-passes reciprocating upsetting extrusion (RUE) deformation with variable temperature. The microstructure evolution and mechanical properties of as-homogenized and RUEed samples were investigated. The results showed that the area fraction of DRX grains gradually increased via the continuous consumption of coarse grains containing lamellar LPSO, and the content of the bulk LPSO phases gradually decreased due to continuous fragmentation. After three passes deformation, the microstructure was almost composed of completely DRXed grains. The LPSO phases with different morphologies were coordinated deformation by kinking, tearing, etc during RUE process. It is worth noting that after four passes, the lamellar LPSO phase did not disappear, but mixed with the fine DRXed grains together. In addition, a mass of particles were produced after each low temperature deformation, indicating that reducing the deformation temperature is beneficial to the dynamic precipitation. The yield tensile strength (TYS), Ultimate tensile strength (UTS) and fracture elongation (FE) of four passes deformed alloy reached 372.6 MPa, 320.8 MPa, 8.1%, respectively. The improvement of mechanical properties is attributed to the two main strengthening mechanisms: grain refinement and LPSO strengthening.

Effect of Pre-Straining Method on Mechanical Properties of Thermo-Mechanically Processed Al-Cu-Mg Alloy

2018 ◽  
Vol 385 ◽  
pp. 364-369 ◽  
Author(s):  
Ivan Zuiko ◽  
Vladislav Kulitckii ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Stress ◽  
Homogeneous Distribution ◽  
Precipitation Behavior ◽  
Nucleation Sites ◽  
Elongation To Failure ◽  
Phase Plates ◽  
Distribution Of Dislocations

The present study deals with the effect of pre-deformation technique of AA2519 alloy (Al–5.64Cu–0.33Mn–0.23Mg–0.15Zr–0.11Ti–0.09V–0.08Fe–0.01Si (wt. %)) under T8 tempers, on condition that intermediate strains are equal. After undergoing T87 by pre-stretching and peak ageing the alloy demonstrates the yield stress, ultimate tensile strength and elongation to failure of 425.4±2.4 MPa, 475±2.4 MPa, 12.1±0.4%, respectively. The 7% pre-straining by rolling leads to-5% decrease in yield stress, practically the same ultimate tensile strength and-20% decrease in ductility. This effect can be ascribed to more homogeneous distribution of dislocations which act as heterogeneous nucleation sites for the θ′-phase precipitation. In addition to precipitates of the Al–Cu family (θ′′ and θ′), Ω-phase plates on {111}α habit plane was observed. The effect of pre-straining prior to ageing on the precipitation behavior and its relation with mechanical properties of the AA2519 is considered.

scholarly journals Hot Rolling vs. Forging: Newly Developed Fe-Al-O Based OPH Alloy

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 228
Author(s):  
Omid Khalaj ◽  
Hana Jirková ◽  
Karolína Burdová ◽  
Adam Stehlík ◽  
Ludmila Kučerová ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Mechanical Alloying ◽  
Hot Rolling ◽  
Secondary Recrystallization ◽  
The Difference ◽  
Significant Production

Two oxide precipitation hardened (OPH) Fe-Al-O-based steels were prepared by mechanical alloying. In addition to the variant using yttria nano-precipitates to improve the mechanical properties, a variant using only alumina precipitates for strengthening was also prepared. Therefore, a more economically acceptable variant of these steels was developed. Hot consolidation is a significant production step for achieving the required mechanical properties. Hot consolidation was performed by either hot rolling or forging. The heat treatment was subsequently performed on both variants (0.85Fe–0.11Al–0.03Y2O3–0.01Y and 0.87Fe–0.11Al–0.02O2) of the alloys to support secondary recrystallization. The paper describes the influence of the consolidation method on grain size, material recrystallization, and mechanical properties. The difference in the consolidation method was reflected in the grain size after the heat treatment, where the material consolidated by hot rolling reached a grain size of almost 200 μm, while after forging the maximum grain size was around 30 μm. A higher ultimate tensile strength was achieved with forged states, both with and without the heat treatment.

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