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首页> 外文期刊>Materials Science and Engineering >Mechanical properties and thermal stability of Al-23Si-8Fe-1Cr and Al-23Si-8Fe-5Mn alloys prepared by powder metallurgy
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Mechanical properties and thermal stability of Al-23Si-8Fe-1Cr and Al-23Si-8Fe-5Mn alloys prepared by powder metallurgy

机译：粉末冶金法制备的Al-23Si-8Fe-1Cr和Al-23Si-8Fe-5Mn合金的力学性能和热稳定性

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摘要

Al-23Si-8Fe-1Cr and Al-23Si-8Fe-5Mn (in wt%) alloys were prepared via melt centrifugal atomization following powder compaction by uni-axial pressing at 6 GPa and 450 ℃ for 60 min. The obtained materials were porosity-free with good particle-to-particle contact. The "composite-like" microstruc-tures were very fine, showing silicon particles distributed in an α-Al matrix and displaying nearly equiaxed intermetallic phases. The intermetallic phases were identified as β-Al_5FeSi and α-Al_(9.3)FeMn_(1.4)Si_(1.8) in the Al-23Si-8Fe-1Cr and Al-23Si-8Fe-5Mn alloys, respectively. The Vickers hardness and compressive yield strength were 182 HV5 and 540 MPa, respectively, for the Al-23Si-8Fe-1Cr alloy and 197 HV5 and 650 MPa, respectively, for the Al-23Si-8Fe-5Mn alloy. The thermal stability of the alloys was studied by mechanical testing after long-term annealing at 300-400 ℃, by compressive testing at 200-300 ℃ and by creep testing at 300 ℃ and 250 MPa. The thermal stability of both alloys was significantly better when compared to the "thermally stable" casting Al-12Si-1Cu-1Mg-1Ni alloy that is commonly utilized in the automotive industry for thermally loaded components such as pistons for combustion or diesel engines.
机译：通过熔融离心雾化通过在6 GPa和450℃下单轴压制粉末压实60分钟，然后通过熔融离心雾化制备Al-23Si-8Fe-1Cr和Al-23Si-8Fe-5Mn（按重量％）合金。所获得的材料是无孔的且具有良好的颗粒间接触。 “类复合物”的微观结构非常细，显示出硅颗粒分布在α-Al基体中，并表现出几乎等轴的金属间相。在Al-23Si-8Fe-1Cr和Al-23Si-8Fe-5Mn合金中，金属间相分别确定为β-Al_5FeSi和α-Al_（9.3）FeMn_（1.4）Si_（1.8）。对于Al-23Si-8Fe-1Cr合金，维氏硬度和抗压屈服强度分别为182 HV5和540 MPa，对于Al-23Si-8Fe-5Mn合金，分别为197 HV5和650 MPa。通过在300-400℃下长期退火后的机械测试，在200-300℃下的压缩测试以及在300℃和250 MPa下的蠕变测试来研究合金的热稳定性。与“热稳定”铸造的Al-12Si-1Cu-1Mg-1Ni合金相比，这两种合金的热稳定性要好得多，后者在汽车工业中通常用于热负载部件，例如燃烧或柴油发动机的活塞。

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