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Effects on the evolution of microstructure and properties of low-silicon cast aluminum alloys in service
Philosophical Magazine ( IF 1.6 ) Pub Date : 2020-05-12 , DOI: 10.1080/14786435.2020.1760390
Tengfei Cheng 1 , Ruixiang Zeng 1 , Dongling Qian 1 , Yitao Yang 1
Affiliation  

ABSTRACT The microstructure evolution and property change of four kinds of low silicon cast aluminum alloy exposed to heat for 0–50 h at 200°C were studied by means of Brinell hardness test, tensile property test, friction and wear property test and XRD analysis. The results show that with increasing thermal exposure time, the tensile strength of each group of samples decreased and the amount of wear increased. The tensile strength of samples with more Si content decreased slowly. When the time increased to 50 h, the increase of wear loss was the largest. The hardness of samples after thermal exposure increases compared with that before thermal exposure. The residual stress of (311) diffraction crystal surface of AlSi3.5Mg0.66 under different thermal exposure time was measured. The type of residual stress changed from residual tensile stress to residual compressive stress after thermal exposure. There is an abnormal phenomenon that the hardness of the sample increased and the amount of wear increased, and it is evident that the distribution of residual stress was inhomogeneous after thermal exposure. It is found that with increasing thermal exposure time to 50 h, the average lattice distortion ε of the low-index crystal plane and the high-index crystal plane in the aluminum alloys gradually increased.

中文翻译:

对服役中低硅铸造铝合金组织和性能演变的影响

摘要 通过布氏硬度试验、拉伸性能试验、摩擦磨损性能试验和XRD分析,研究了4种低硅铸造铝合金在200°C加热0-50 h后的组织演变和性能变化。结果表明,随着热暴露时间的增加,各组试样的抗拉强度降低,磨损量增加。Si含量较多的样品的抗拉强度下降缓慢。当时间增加到 50 h 时,磨损量的增加幅度最大。与热暴露前相比,热暴露后样品的硬度增加。测量了不同热暴露时间下AlSi3.5Mg0.66(311)衍射晶面的残余应力。热暴露后残余应力的类型从残余拉应力变为残余压应力。存在试样硬度增加、磨损量增加的异常现象,可见热暴露后残余应力分布不均匀。发现随着热暴露时间增加到50 h,铝合金中低折射率晶面和高折射率晶面的平均晶格畸变ε逐渐增大。
更新日期:2020-05-12
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