scholarly journals Microstructure, Mechanical Properties and Strengthening Mechanism Analysis in an AlMg5 Aluminium Alloy Processed by ECAP and Subsequent Ageing

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 969 ◽  
Author(s):  
Przemysław Snopiński ◽  
Mariusz Król
Keyword(s):  
Yield Strength ◽  
Aluminium Alloy ◽  
Mutual Influence ◽  
Electron Backscatter Diffraction ◽  
Shear Bands ◽  
Strengthening Mechanism ◽  
Optical Microscope ◽  
Coarse Grained ◽  
High Yield ◽  
Mechanism Analysis

A coarse-grained microstructure of solution treated AlMg5 aluminium alloy was prepared by equal channel angular pressing through route BC. Microstructure evolution of the alloy was analysed by using an optical microscope, X-ray diffraction, and EBSD (electron backscatter diffraction). The results reported that grains were refined due to the interactions of shear bands with low-to-moderate grain boundaries, and this structure was transformed into a bimodal after ageing at 180 °C for 4 h. Moreover, the results of the tensile testing showed that the yield strength was increased from 110 to 326 MPa, and the corresponding tensile strength increased from 269 to 395 MPa, maintaining an appropriate elongation of ~18%. After ageing at 180 °C elongation increased to 23% and the sample still kept high yield strength of 255 MPa, which may be associated with the mutual influence of the dislocation density decrease and recrystallization processes.

scholarly journals Mechanical Performances of Al-Si-Mg Alloy with Dilute Sc and Sr Elements

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 665 ◽  
Author(s):  
Zichen Zhang ◽  
Qingfeng Zhao ◽  
Lihua Liu ◽  
Xingchuan Xia ◽  
Cheng Zheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Yield Strength ◽  
Fracture Morphology ◽  
Strengthening Mechanism ◽  
Mg Alloy ◽  
Mechanism Analysis ◽  
Temperature Range ◽  
Stable Yield ◽  
Mechanical Performances ◽  
First Time

Due to its excellent comprehensive performances, Al-Si-Mg alloy i widely used in automotive, transportation and other fields. In this work, tensile performances and fracture behavior of Al-Si-Mg alloy modified by dilute Sc and Sr elements (Al-7.12Si-0.36Mg-0.2Sc-0.005Sr) were investigated at the temperature of −60–200 °C for the first time, aiming to obtain a satisfactory thermal stability within a certain temperature range. The results showed that the new designed Al-Si-Mg alloy possessed a completely stable yield strength and a higher-level elongation under the present conditions. Fracture morphology analysis, fracture profile observation and strengthening mechanism analysis were applied to elucidate the evolution mechanisms of yield strength and elongation of the alloy. The fracture modes were significantly distinct in different temperature sections, and the reasons were discussed. In addition, the interaction among the nano precipitate phase particles, the deformation substructure and the dislocations were responsible for the thermal stability of the alloy within a certain temperature range.

Microstructures and Mechanical Properties of Bulk Nanocrystalline Fe3Al Materials With 5, 10 and 15 wt. % Cu Prepared by Aluminothermic Reaction

2011 ◽  
Vol 236-238 ◽  
pp. 2191-2196 ◽  
Author(s):  
Yu Peng Wei ◽  
Pei Qing La ◽  
Mei Dan Que ◽  
Wen Sheng Li ◽  
Yang Yang ◽  
...  
Keyword(s):  
Yield Strength ◽  
Optical Microscope ◽  
Matrix Phase ◽  
Coarse Grained ◽  
Compressive Yield Strength ◽  
Nanocrystalline Phase ◽  
X Ray Diffraction ◽  
Aluminothermic Reaction ◽  
Transmission Electron ◽  
Bulk Nanocrystalline

Bulk nanocrystalline Fe3Al based materials with 5, 10 and 15 wt. % Cu were prepared by aluminothermic reaction in which the melts were superheated about 1600 K before solidification. Microstructures of those materials were investigated by optical microscope, electron probe microanalysis, X-ray diffraction and transmission electron microscope. It was shown that microstructures of the materials consisted of a nanocrystalline matrix phase and a little contamination Al2O3and Fe3AlCxfiber phases. The nanocrystalline matrix phase was composed of Fe, Al and Cu elements and disordered bcc which did not change with content of Cu. Average grain sizes of the nanocrystalline phase of the materials with 5, 10 and 15 wt. % Cu were 18, 24 and 25 nm respectively and that of the material with 5 wt. % Cu was the smallest. Compressive properties of the materials were tested. The material with 5 wt. % Cu has good ductility compared with the materials with 10 and 15 wt. % Cu. Yield strength of the materials was about two times higher than that of coarse grained Fe3Al material. The compressive yield strength of the material with 5 wt. % Cu was higher than those of the materials with 10 and 15 wt. % Cu and its flow stress in compression was up to about 1500 MPa.

Effects of W Addition on Microstructure and 650 °C Mechanical Properties of Ti-Al-Sn-Zr-Mo-Nb-W-Si Alloy

2021 ◽  
Vol 904 ◽  
pp. 53-58
Author(s):  
Wen Jing Zhang ◽  
Hao Feng Xie ◽  
Li Jun Peng ◽  
Zhen Yang ◽  
Guo Jie Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Temperature ◽  
Yield Strength ◽  
Stress Rupture ◽  
Tensile Tests ◽  
Optical Microscope ◽  
High Yield ◽  
Strengthening Effect ◽  
Α Phase

The influence of W addition on microstructure and mechanical properties of Ti-Al-Sn-Zr-Mo-Nb-W-Si high temperature titanium alloys are investigated by optical microscope (OM), scanning electron microscopy (SEM), electron probe microanalysis (EPMA), tensile tests and large stress endurance tests at 650 °C. The results show that W is mainly solubilized in β phase. Microstructure observations indicate an obvious reduction in the size of transformed β structure (βt), primary α phase (αp) and the thickness of secondary lamellar α phase (αL), with the increase of W content. It is also observed that adding more W could improve the elongation, tensile strength and large stress rupture properties at 650 °C. However, combined with previous research, adding more β stabilizing elements could refine the size of each phase, which will be detrimental to the high temperature yield strength of the alloy. Therefore, in order to reasonably utilize the strengthening effect of W and make the alloy have high yield strength and tensile strength at 650 °C, its content should be controlled between 1 ~ 2 wt%

scholarly journals Outstanding Tensile Properties and Their Origins in Twinning-Induced Plasticity (TWIP) Steels with Gradient Substructures

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1184 ◽  
Author(s):  
Huihui Zhi ◽  
Cheng Zhang ◽  
Zihui Guo ◽  
Stoichko Antonov ◽  
Yanjing Su
Keyword(s):  
Yield Strength ◽  
Back Stress ◽  
Tensile Tests ◽  
Coarse Grained ◽  
High Yield ◽  
Uniaxial Tensile ◽  
High Ductility ◽  
Strengthening Mechanisms ◽  
High Yield Strength ◽  
Twip Steels

The low yield strength (~300 MPa) of twinning-induced plasticity (TWIP) steels greatly limits their structural applications in the industrial field. Conventional strengthening mechanisms usually cause an enhancement of yield strength but also a severe loss of ductility. In this research, gradient substructures were introduced in the Fe-22Mn-0.6C TWIP steels by different pre-torsional deformation in order to overcome the above limitations. The substructure evolution, mechanical properties, and their origins in gradient-substructured (GS) TWIP steels were measured and compared by electron backscattered diffraction (EBSD), monotonous and loading-unloading-reloading (LUR) tensile tests. It was found that a simple torsional treatment could prepare gradient twins and dislocations in coarse-grained TWIP steel samples depending on torsional strain. The uniaxial tensile tests indicated that a superior combination of high yield strength, high ultimate strength, and considerable ductility was simultaneously obtained in the GS samples. The high yield strength and high ultimate tensile strength were attributed to synergetic strengthening mechanisms, viz., dislocation strengthening, due to the accumulation of high density of dislocations, and very high back stress strengthening due to gradient substructure distribution, which was accommodated through pile-ups of extra geometrically necessary dislocations (GNDs) across the sample-scale. Additionally, high ductility originated from gradient substructure-induced back stress hardening. The present study is also beneficial to the design efforts of high strength and high ductility of other heterogeneous-structured TWIP alloy systems.

scholarly journals Grain Size Effect on the Mechanical Behavior of Metastable Fe-23Cr-8.5Ni Alloy

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 734 ◽  
Author(s):  
Lin Xie ◽  
Chunpeng Wang ◽  
Yuhui Wang ◽  
Guilin Wu ◽  
Xiaoxu Huang
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Size Effect ◽  
Mechanical Behavior ◽  
Tensile Elongation ◽  
Model Material ◽  
Coarse Grained ◽  
High Yield ◽  
Grain Size Effect ◽  
Structural Refinement

An Fe-23Cr-8.5Ni alloy was used as a model material to study the grain size effect on the mechanical behavior of metastable duplex metal. Alloy samples with different grain sizes ranging from 0.1 to 2 μm were prepared by cold-rolling and annealing. A structural refinement to about 0.1 μm results in a high yield strength but very limited ductility. A significant improvement of ductility occurred at the grain size of about 0.4 μm. A further increase in grain size results in a decreased strength and a slightly improved ductility. The alloy with a grain size of about 0.4 μm exhibits an excellent combination of strength and ductility, where the yield strength and tensile elongation are increased up to 738 MPa and 29% as compared to 320 MPa and 33% of a coarse-grained (about 2 μm) sample, respectively. The origin of the excellent mechanical properties was attributed to the unique deformation characteristics associated with the transformation induced plasticity and the development of back stress.

DURIMPHY

Alloy Digest ◽  
2007 ◽  
Vol 56 (2) ◽  
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Yield Strength ◽  
Physical Properties ◽  
Precipitation Hardening ◽  
Heat Treating ◽  
High Yield ◽  
High Yield Strength ◽  
Precision Alloys ◽  
Very High

Abstract Durimphy is a maraging steel with 1724 MPa (250 ksi) tensile strength and a very high yield strength due to precipitation hardening. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: FE-140. Producer or source: Metalimphy Precision Alloys.

SUPRALSIM 690

Alloy Digest ◽  
2011 ◽  
Vol 60 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
High Yield ◽  
Bend Strength ◽  
High Yield Strength ◽  
Weight Saving

Abstract Supralsim 690 is high yield strength steel for welded and weight-saving structures. This datasheet provides information on composition, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming and joining. Filing Code: SA-637. Producer or source: Industeel USA, LLC.

SUPERELSO 1100

Alloy Digest ◽  
2012 ◽  
Vol 61 (6) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
High Yield ◽  
Steel Alloy ◽  
High Yield Strength ◽  
Weight Saving ◽  
Quenched And Tempered Steel ◽  
Tempered Steel

Abstract SuperElso 1100 is a high yield strength quenched and tempered steel alloy. For welded and weight-saving structures. This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on forming, machining, and joining. Filing Code: SA-654. Producer or source: Industeel USA, LLC.

REPUBLIC 50

Alloy Digest ◽  
1967 ◽  
Vol 16 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
High Strength ◽  
Heat Treating ◽  
High Yield ◽  
Bend Strength ◽  
High Yield Strength

Abstract Republic 50 is a high-strength low-alloy structural steel recommended where high yield strength and toughness combined with good weldability and corrosion resistance are required. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive, shear, and bend strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-205. Producer or source: Republic Steel Corporation.

HISTAR 355

Alloy Digest ◽  
2015 ◽  
Vol 64 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
Low Temperatures ◽  
High Yield ◽  
High Yield Strength

Abstract Histar 355 is a structural steel combining high yield strength (355 MPa minimum) with excellent toughness at low temperatures and outstanding weldability. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength as well as fracture toughness. It also includes information on forming, machining, and joining. Filing Code: SA-731. Producer or source: ArcelorMittal and ArcelorMittal Luxembourg.

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