Microstructure and Mechanical Properties of Mg-Al-Ca Alloys with Yttrium Addition

2007 ◽  
Vol 345-346 ◽  
pp. 73-76 ◽  
Author(s):  
Young Kyun Kim ◽  
Hyeon Taek Son ◽  
Jae Seol Lee ◽  
Ik Hyun Oh ◽  
H.J. Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compound ◽  
Yield Strength ◽  
Grain Boundary ◽  
Intermetallic Phase ◽  
Solution Treated ◽  
Microstructure And Mechanical Properties ◽  
Yttrium Addition ◽  
Hardness Values ◽  
Cast Microstructure

The aims of this study are to investigate the effect of Y (yttrium) addition in the Mg-Al- Ca alloys on microstructure and mechanical properties. In additions, the alloys were solution treated in order to achieve a better understanding of the precipitation mechanisms. The as-cast microstructure of Mg-5Al-3Ca alloy and Mg-5Al-3Ca-xY alloys contains dendritic α-Mg matrix and eutectic intermetallic compound at grain boundary. The hardness values of Mg-Al-Ca alloy with Y additions were slightly increased than that of Mg-Al-Ca with no Y addition. It is because of reduction of α-Mg phase and presence of (Mg,Al)2Ca and Al-Y rich intermetallic phase at grain boundary and α-Mg matrix grains. Also, hardness value of yttrium (Y) containing alloys was increased with increasing Y contents. Compared to Mg-5Al-3Ca alloy, maximum strength and yield strength of the alloys with Y additions have slightly increased with increasing Y additions in the case of as-cast samples.

Effects of Yttrium on Microstructure and Mechanical Properties of In Situ (Al2O3+Al3Zr)p/A356 Composites

2010 ◽  
Vol 152-153 ◽  
pp. 1083-1087
Author(s):  
Bo Wang ◽  
Yu Tao Zhao ◽  
Song Li Zhang ◽  
Gang Chen ◽  
Xiao Nong Cheng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Test Results ◽  
Microstructure And Mechanical Properties ◽  
Yttrium Addition

In-situ (Al2O3+Al3Zr)p/A356 composites were synthesized by melt reaction technology and the effects of yttrium on microstructure and mechanical properties of the composites are investigated. The results indicate that the reinforced particulates Al2O3 and Al3Zr become smaller in size with yttrium addition, the sizes are about 0.5~2μm. The distribution becomes more homogeneous, the morphologies are spheroid-shape and ellipsoid-shape, the ambitus is blunt. The mechanical properties test results show the mechanical properties of the composites are greatly enhanced. With 0.4wt.% yttrium addition, the ultimate tensile strength and yield strength of the composites reach to 388MPa and 296MPa, which are increased 35.6% and 37.0% comparing with no yttrium addition, respectively. The effect mechanisms of yttrium are discussed.

Effects of Aluminum Content on the As-Cast Microstructure and Mechanical Properties of Mg-xAl-0.7Si Based Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 191-194
Author(s):  
Ming Bo Yang ◽  
Fu Sheng Pan ◽  
Liang Bai ◽  
Ren Ju Cheng
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Xrd Analysis ◽  
Chinese Script ◽  
X Ray Diffraction ◽  
Mg2si Phase ◽  
Al Content ◽  
Microstructure And Mechanical Properties ◽  
Mg17al12 Phase ◽  
Cast Microstructure

The effects of the Al content on the as-cast microstructure and mechanical properties of Mg-xAl-0.7Si based magnesium alloys which contained 1%Zn, 0.25%Mn, 0.4%Sb and 0.25%RE were investigated by optical microscopy(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD) analysis and tensile testing. The results indicated that the effects of the Al content from 6% to 8% on the alloy phase types of the experimental alloys were not obvious, and the as-cast microstructure of the experimental alloys with different Al content were composed mainly of the α-Mg matrix, Mg17Al12 phase, Mg2Si phase and Mg3Sb2 phase. The Chinese script morphology of the Mg2Si phase was very obvious in the experimental alloy with 6%Al. With the increase of Al content from 6% to 8%, the yield strength of the experimental Mg-xA1-0.7Si based alloys at room temperature increased, but the yield strength of the experimental Mg-xA1-0.7Si based alloys at 150 °C decreased.

Microstructure and Mechanical Properties of Mg-Al-Ca-Sm Alloys at High Temperature

2007 ◽  
Vol 345-346 ◽  
pp. 653-656 ◽  
Author(s):  
Hyeon Taek Son ◽  
Jae Seol Lee ◽  
Ji Min Hong ◽  
Ik Hyun Oh ◽  
Kyosuke Yoshimi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Elevated Temperature ◽  
Intermetallic Compound ◽  
Grain Boundary ◽  
Intermetallic Compounds ◽  
Ultimate Strength ◽  
Maximum Yield ◽  
Microstructure And Mechanical Properties ◽  
Equiaxed Grain

The aims of this research are to investigate the effect of Sm addition in Mg-Al-Ca alloys on microstructure and mechanical properties. Sm addition to Mg-5Al-3Ca based alloys results in the change from dendritic to equiaxed grain morphorlogy and formation of Al-Sm rich itermetallic compounds at grain boundary and α-Mg matrix. And these Al-Sm rich intermetallic compounds were dispersed homogeously and stabilized at high temperature. And maximum yield and ultimate strength value was obtained at Mg-5Al-3Ca-2Sm alloys at elevated temperature because of homogeneous dispersion of stable Al-Sm rich intermetallic compound at high temperature.

Effects of Yttrium Addition on Microstructure and Mechanical Properties of AZ80–2Sn Magnesium Alloys

2015 ◽  
Vol 34 (8) ◽  
Author(s):  
Hansong Xue ◽  
Gang Yang ◽  
Di Li ◽  
Zhihui Xing ◽  
Fusheng Pan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure And Mechanical Properties ◽  
Yttrium Addition ◽  
Scanning Electron ◽  
Cast Microstructure

AbstractThe effects of Y on microstructure and mechanical properties of as-cast AZ80–2Sn magnesium alloys were investigated by optical microscopy, scanning electron microscopy and X-ray diffraction. Y addition not only changes the as-cast microstructure but also influences the mechanical properties of AZ80–2Sn alloy. Unmodified AZ80–2Sn alloys under casting state show that Mg

scholarly journals Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens

2020 ◽  
Vol 9 (4) ◽  
pp. 7870-7879 ◽  
Author(s):  
Elisabeta Mirela Cojocaru ◽  
Doina Raducanu ◽  
Saleh Sabah Alturaihi ◽  
Anna Nocivin ◽  
George Coman ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solution Treated ◽  
Microstructure And Mechanical Properties

Effect of Tempering Time on Microstructure and Mechanical Properties of SA738 Gr.B Steel

2021 ◽  
Vol 1016 ◽  
pp. 1739-1746
Author(s):  
Yan Mei Li ◽  
Shu Zhan Zhang ◽  
Zai Wei Jiang ◽  
Sheng Yu ◽  
Qi Bin Ye ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Yield Strength ◽  
Microstructure Evolution ◽  
Impact Energy ◽  
Nuclear Power ◽  
Microstructure And Mechanical Properties ◽  
The Impact ◽  
Tempering Time

The effect of tempering time on the microstructure and mechanical properties of SA738 Gr.B nuclear power steel was studied using SEM, TEM and thermodynamic software, and its precipitation and microstructure evolution during tempering were clarified. The results showed that SA738 Gr.B nuclear power steel has better comprehensive mechanical properties after tempering at 650 °C for 1h. With the extension of the tempering time, M3C transformed into M23C6 with increasing size, which affected the yield strength and impact energy. When the tempering time is 8h ~ 10h, due to the transformation of M3C to M23C6, the composition of matrix around the carbide changed, causing the temperature of Ac1 dropped, forming twin-martensite which deteriorated the impact toughness of the steel.

scholarly journals Effects of Boron Addition on the Microstructure and Mechanical Properties of (Ti,Ta)(C,N)-Co Based Cermets

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 787
Author(s):  
Ernesto Chicardi ◽  
Francisco José Gotor Martínez
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Intermetallic Compound ◽  
Solid Solutions ◽  
General Trend ◽  
Liquid Phase Sintering ◽  
Binder Phase ◽  
Boron Addition ◽  
Sintering Additive ◽  
Microstructure And Mechanical Properties

In this work, a titanium–tantalum carbonitride based cermet, with cobalt as the binder phase and boron as a sintering additive, was developed by a mechanically induced self-sustaining reaction process using two different methodologies. The boron additive was added to prevent the formation of brittle intermetallic compounds generally formed during the liquid phase sintering step due to the excessive ceramic dissolution into the molten binder phase. A systematic study was carried out to understand the effects of boron addition on the nature of the phases, microstructure, and mechanical properties of cermets. With the boron addition, the formation of two different boride solid solutions, i.e., (Ti,Ta)B2 and (Ti,Ta)3B4, was observed. Moreover, the nature of the binder was also modified, from the (Ti,Ta)Co2 brittle intermetallic compound (for cermets without boron addition) to ductile and tough (Ti,Ta)Co3 and α-Co phases (for cermets with boron addition). These modifications caused, as a general trend, the increase of hardness and toughness in cermets.

Study on Hardening Potential of Isostatic Pressed Beryllium

2020 ◽  
Vol 842 ◽  
pp. 199-204
Author(s):  
Boris Syrnev ◽  
Alexandr Revutskiy ◽  
Oksana Semilutskaya
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Grain Boundary ◽  
Elastic Limit ◽  
Hot Isostatic Pressing ◽  
Beryllium Oxide ◽  
Electron Microscopic ◽  
Research Results ◽  
Reinforcing Particles ◽  
Microscopic Studies

The effect of beryllium hardening has been studied. Beryllium is sintered by method of hot isostatic pressing (HIP), depending on the temperature of powders pressing. The research results of electron microscopic studies were the base for demonstrating formation of the hydraulic phase at the grain boundary of sintered beryllium and influence of the reinforcing phase on the mechanical properties of the HIP blank. The dependence of beryllium precision elastic limit and conventional yield strength from the size of the reinforcing particles of beryllium oxide has been found. The obtained equation provides a description of the “dispersion-grain-boundary" mechanism of isostatic pressed Beryllium hardening.

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