scholarly journals Novel AM60-SiO2 Nanocomposite Produced via Ultrasound-Assisted Casting; Production and Characterization

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3976 ◽  
Author(s):  
Farzan Barati ◽  
Mojtaba Latifi ◽  
Ehsan Moayeri far ◽  
Mohammad Hossein Mosallanejad ◽  
Abdollah Saboori
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Shear Fracture ◽  
Sio2 Nanoparticles ◽  
New Materials ◽  
Casting Method ◽  
Ultrasound Assisted ◽  
First Time ◽  
Casting Production ◽  
Composite Samples

There has been growing interest in developing new materials with higher strength-to-weight ratios. Therefore, AM60 magnesium alloy reinforced with SiO2 nanoparticles was synthesized using ultrasound-casting method for the first time, in this study. We introduced 1 and 2 wt.% of SiO2 nanoparticles into the samples. Introduction of nanoparticles led to the grain size drop in MS2 (AM60 + 2 wt.% SiO2) samples. In addition, this increased the hardness of samples from 34.8 Vickers hardness (HV) in M (AM60) to 51.5 HV in MS2, and increased the compressive strength of MS2. Improvement of the mechanical properties can be attributed to a combination of Orowan, Hall–Petch and load-bearing mechanisms. However, ductility of the composites decreased with fracture strains being 0.41, 0.39 and 0.37, respectively, for samples M, MS1 and MS2. Fracture surfaces showed shear fracture in both composite samples with microcracks and a more brittle fracture in MS2.

scholarly journals Direct Correlations among the Grain Size, Texture, and Indentation Behavior of Nanocrystalline Nickel Coatings

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 188 ◽  
Author(s):  
Lu Feng ◽  
Yong-Yue Ren ◽  
Yan-heng Zhang ◽  
Shibin Wang ◽  
Linan Li
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Elastic Modulus ◽  
Elastic Anisotropy ◽  
Texture Coefficient ◽  
Process Conditions ◽  
Nickel Coatings ◽  
Fundamental Relationship ◽  
Underlying Mechanisms ◽  
First Time

By using nc-Ni coatings as a model system, systematic experiments were designed to evaluate the interaction between the microstructural and mechanical properties tailored by electrodeposition conditions. A direct correlation between grain size and texture was established for the first time. The grain size of the (111) crystalline plane decreases with the texture coefficient (RTC) regardless of the process conditions, and that of the (220) plane has different trends. Then, a peculiar phenomenon is revealed that the dependence of hardness on grain size is accurately described by the Hall-Petch relationship when changing the temperature or pH, but with different slopes, while it deviates from such a relationship with changing current density, denoting more underlying mechanisms related to texture. Finally, a surprising degree of influence of texture on hardness and elastic modulus is also presented, with the overall trend of hardness increasing with texture; and when the RTC of (111) exceeds 40%, the elastic modulus increases with texture, implying a fundamental relationship between modulus and texture. Texture predominates over the other factors on the elastic modulus, revealing the importance of elastic anisotropy. Significantly, the present work suggests a useful tailoring routine to fabricate high quality nc-Ni coatings with the desired structure and mechanical properties.

Effect of Nd Content and Heat Treatment on Microstructure and Mechanical Properties of Mg-Zn-Nd Alloy

2017 ◽  
Vol 898 ◽  
pp. 124-130 ◽  
Author(s):  
Shu Min Xu ◽  
Xin Ying Teng ◽  
Xing Jing Ge ◽  
Jin Yang Zhang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Cast Alloy ◽  
Second Phase ◽  
Casting Method ◽  
Magnesium Matrix ◽  
Microstructure And Mechanical Properties

In this paper, the microstructure and mechanical properties of the as-cast and heat treatment of Mg-Zn-Nd alloy was investigated. The alloy was manufactured by a conventional casting method, and then subjected to a heat treatment. The results showed that the microstructure of as-cast alloy was comprised of α-Mg matrix and Mg12Nd phase. With increase of Nd content, the grain size gradually decreased from 25.38 μm to 9.82 μm. The ultimate tensile strength and elongation at room temperature of the Mg94Zn2Nd4 alloy can be reached to 219.63 MPa and 5.31%. After heat treatment, part of the second phase dissolved into the magnesium matrix and the grain size became a little larger than that of the as-cast. The ultimate tensile strength was declined by about 2.5%, and the elongation was increased to 5.47%.

Effect of Equal Channel Angular Pressing on Microstructure and Mechanical Properties of As-Cast Al-B4C Composite

2015 ◽  
Vol 813-814 ◽  
pp. 34-39
Author(s):  
Karunanaithi Saravanan ◽  
Mariappan Senthil Kumar ◽  
Perumal Venkatachalam ◽  
Rajaram Raghavan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Automobile Industry ◽  
Metal Matrix ◽  
Sand Casting ◽  
Casting Method ◽  
Angular Pressing ◽  
Composite Microstructure

In this experiment, comparison analysis of mechanical properties, porosity and grain size of Pure Al (powder), 95%AL + 5% B4C (With sand casting method) and 95%AL + 5% B4C (With ECAP method) are determined. The ECAP method value is much greater than the sand casting method,because of metal matrix composite microstructure refinement during the pressing operation. Because of material porosity value decreases, powder particle consolidation, the closure of porosity, grain refinement and improve in dislocation occurs as ECAP method gives the results of Mechanical properties as like tensile strength 105.8Mpa, Hardness 94HV, density 888.88kg/m3values increase. At the same time, porosity and grain size value will be reduced because of individual power consolidation happening during ECAP methods like as 1.63% and 8μm. In this metal matrix composite is applied to aeronautical and automobile industry

Sintering and Mechanical Properties of Alumina Ceramics Prepared by Nanosize Alumina

2007 ◽  
Vol 544-545 ◽  
pp. 821-824
Author(s):  
Indra ◽  
S.W. Oh ◽  
Hee Joon Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Relative Density ◽  
Mechanical Characteristics ◽  
Indentation Test ◽  
Test System ◽  
Alumina Ceramics ◽  
New Materials ◽  
Size Dependent

This work examined the mechanical properties of alumina that can directly be enhanced by ratio of nano sized alumina powders additives to micro size alumina powders (n/m ratio). These new materials have mechanical properties that are strongly grain size dependent and often significantly different from those of their coarser grained counter parts. The mechanical characteristics of samples were observed by using the indentation test system. This data shows that the relative density for the sample is increased with increasing Meyer hardness.

scholarly journals Preparation and Properties of Ti-Y2O3 Composites for Implant Applications

2017 ◽  
Vol 62 (2) ◽  
pp. 663-666
Author(s):  
G. Adamek ◽  
J. Jakubowicz ◽  
M. Dewidar
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Corrosion Resistance ◽  
Mechanical Alloying ◽  
Size Structure ◽  
Young Modulus ◽  
Argon Atmosphere ◽  
New Materials ◽  
High Corrosion Resistance ◽  
Metallic Biomaterials

AbstractThe paper presents the preparation of Ti-(1-30wt.%)Y2O3composites using the mechanical alloying process. Ti based materials are the best metallic biomaterials because of their excellent properties: biocompatibility, low Young moduli and high corrosion resistance. Pure Ti and Y2O3powders were alloyed under argon atmosphere in shaker type mill (Spex 8000) followed by pressing and sintering.The ultra-low grain size structure improves the mechanical properties and hardness of the new materials in comparison to microcrystalline Ti-based sinters. However, because of the porosity of approx. 20-30%, a decrease in the Young modulus is observed. Moreover, the new composites show good tendency towards covering by Ca-P compounds during soaking in SBF.

Microstructure and Mechanical Properties of Mg-1Mn-0.6Ce Alloy Containing Yttrium

2011 ◽  
Vol 391-392 ◽  
pp. 638-641
Author(s):  
G.H. Su ◽  
Y. Sun ◽  
Zhan Yi Cao
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Yield Strength ◽  
Mass Fraction ◽  
Room Temperature ◽  
Precipitation Strengthening ◽  
Casting Method ◽  
Microstructure And Mechanical Properties ◽  
Cast Alloys

Mg-1Mn-0.6Ce-xY (x=0, 1, 2 and 3, mass fraction, %) magnesium alloys were prepared by casting method. And the influences of yttrium on microstructure and mechanical properties of the Mg-1Mn-0.6Ce magnesium alloy were investigated. The results reveal that the addition of yttrium to the Mg-1Mn-0.6Ce alloy could reduce the grain size of the as-cast alloys and improve mechanical properties during the investigated temperature range. The Mg-1Mn-0.6Ce-1Y alloy exhibits maximum ultimate strength, yield strength, elongation and the values are 152 MPa, 72 MPa and 13.4% and enhanced about 23.1%, 63.6% and 38.1% compared with those of Mg-1Mn-0.6Ce alloy at room temperature, respectively. The improvement of mechanical properties are attributed to the grain refinement and the precipitation strengthening generated by the Mg12Ce phase particles and the fine Mg24Y5 precipitations.

Effect of Al5Ti1B Master Alloy on Microstructure and Mechanical Properties of Al-5wt.%Cu based Alloy

2014 ◽  
Vol 1051 ◽  
pp. 195-198 ◽  
Author(s):  
Ming Yu Xie ◽  
Si Hai Ao ◽  
Xiang Wang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Master Alloy ◽  
Heterogeneous Nucleation ◽  
Aging Treatment ◽  
Casting Method ◽  
Nucleation Sites ◽  
Average Grain Size ◽  
Addition Level ◽  
Different Levels

The Al-5wt.%Cu based alloy with different levels of Al5Ti1B master alloy additions have been prepared by conventional casting method. The effect of Al5Ti1B contents on microstructure of Al-Cu based alloy was studied by means of XRD, OM and SEM. The results show that when the addition level of Al5Ti1B master alloy is less than 0.6wt.%, the average grain size of the alloys decreases with the increase of Al5Ti1B content. But the grain size increases somewhat with further addition of Al5Ti1B. It is considered that TiB2 particles can serve as the heterogeneous nucleation sites of α-Al during solidification, and heterogeneous nucleation is the main reason of the grain refinement of Al-Cu based alloy. The superior comprehensive mechanical properties of tensile strength of 435 MPa and elongation of 11% of the refined Al-5wt.%Cu based alloy with 0.6% Al5Ti1B were obtained after solution and aging treatment.

Effect of Cerium Addition on the Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy

2008 ◽  
Vol 279 ◽  
pp. 97-103 ◽  
Author(s):  
Anil K. Chaubey ◽  
S. Mohapatra ◽  
B. Bhoi ◽  
J.L. Gumaste ◽  
Barada Kanta Mishra ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Strengthening Mechanism ◽  
Casting Method ◽  
Cu Alloy ◽  
Microstructure And Mechanical Properties ◽  
Cast Alloys ◽  
Mould Casting

Al–8.6Zn–2.6Mg-2.4Cu–xCe(x = 0–0.4 wt. %) alloys were prepared by metal mould casting method, the effects of Ce on the microstructure and mechanical properties of the alloys were investigated. The results showed that the dendrite as well as grain size were refined by the addition of Ce, and the best refinement was obtained in 0.25 wt % Ce containing alloy. The main phases in the as-cast alloys were α-Al, Mg-Zn32, Mg32 (Al, Zn)49, and Al4Ce phase was found in the alloys containing more than 0.1%Ce. The addition of Ce improved the mechanical properties of the alloys. The strengthening mechanism was attributed to grain refinement and compound reinforced

scholarly journals Petrophysical Properties of Limestones - Influence On Behaviour Under Different Environmental Conditions And Applications

2021 ◽  
Author(s):  
Luís Sousa ◽  
Johanna Menningen ◽  
Rubén López-Doncel ◽  
Siegfried Siegesmund
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Iron Oxides ◽  
Environmental Conditions ◽  
Mineralogical Composition ◽  
Petrophysical Properties ◽  
Clay Swelling ◽  
Main Factors ◽  
First Time ◽  
Weathering Resistance

Abstract Limestones have wide variety, namely by differences in the process of formation, mineralogical composition, grain size and texture. Such variability leads to differences in weathering characteristics and behaviour under different environmental conditions and applications. Therefore, detailed studies are mandatory to assess the main factors controlling the physical-mechanical properties and the durability to propose the best applications for the limestones. This study presents the petrographic and petrophysical data of eleven selected Portuguese limestones. Texture, mineralogy and porosity were identified as key parameters for the durability of limestones. Two main groups were identified regarding the texture/petrography and weathering resistance; the compact micritic limestones and with the sparitic grainstones. For the first time an outstanding bowing behaviour was identified in a limestone, probably related with clay swelling minerals and iron oxides present in the micrite groundmass around or in the stylolitic planes.

Preparation and Characterization of As-Cast and As-Extruded Mg-1Mn-0.6Ce-3Y Alloy

2016 ◽  
Vol 849 ◽  
pp. 203-208 ◽  
Author(s):  
Gui Hua Su ◽  
Xue Ran Liu ◽  
Zhan Yi Cao
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Extrusion Ratio ◽  
Casting Method ◽  
Cast Sample ◽  
Cast Ingot ◽  
Average Grain Size ◽  
Mould Casting

Mg-1Mn-0.6Ce-3Y alloy was prepared by metal mould casting method. The as-cast ingot was homogenized and then hot-extruded by an extrusion ratio of 16:1 at 380 °C. Microstructure and mechanical properties of the as-cast and hot-extruded samples were investigated. The results showed that the as-cast sample mainly consisted of α-Mg, Mg12Ce, and Mg24Y5 phases. The average grain size of the sample homogenized at 380 °C was about 100μm, and it was greatly refined to about 6μm by dynamic recrystallization for the hot-extruded sample. The ultimate tensile strength, 0.2% yield strength and elongation of the hot-extruded sample were 244 MPa, 178 MPa and 37.5%, respectively. They were enhanced by 82%, 197% and 400%, correspondingly compared with those of the as-cast sample. The improvement of the strengths was attributed to the grain refinement, breakup of the precipitates and increase of the dislocation density.

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