Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第5期    总第170期    2013年5月

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文章编号:1004-0609(2013)05-1307-08
热处理对喷射沉积Al-27%Si合金显微组织及力学性能的影响
刘文水,王日初,彭超群,莫静贻,朱学卫,彭 健,马如龙

(中南大学 材料科学与工程学院,长沙 410083)

摘 要: 采用喷射沉积和热挤压致密化相结合的方法制备Al-27%Si合金,研究热处理对合金的组织及性能的影响。利用金相显微镜、扫描电镜和MTS-858型疲劳试验机等手段对Al-27%Si合金喷射沉积挤压态和热处理态的显微组织和力学性能进行观察与测试。结果表明:喷射沉积Al-27%Si合金组织细小均匀,初晶Si均匀弥散地分布在连续Al基体中,无针状共晶硅存在;采用合理的热挤压致密化工艺可以显著消除材料中的孔隙,致密度达到99.5%;热处理能够进一步改善材料的组织,但会降低材料的屈服强度。

 

关键字: 喷射沉积;Al-27%Si合金;热挤压;热处理;组织;屈服强度

Effects of heat treatments on microstructures and mechanical properties of spray-deposited Al-27%Si alloy
LIU Wen-shui, WANG Ri-chu, PENG Chao-qun, MO Jing-yi, ZHU Xue-wei, PENG Jian, MA Ru-long

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:A kind of novel packaging material, Al-27% alloy, was prepared by a method comprised of spray deposition and subsequent hot extrusion, then, the effects of heat treatments on the microstructures and mechanical properties of the alloy were studied. The microstructures and mechanical properties of hot extruded and heat treated Al-27%Si alloy were investigated with optical microscope, scanning electronic microscope and MTS-858 type fatigue testing machine. The experimental results show that the spray-deposited Al-27%Si alloy after hot extrusion has fine, homogeneous microstructure with no needle-like eutectic Si but small primary Si particles uniformly dispersed in the Al matrix, besides an increase of size to some degree, even the following heat treatments make little difference to it. Appropriate hot extrusion process can eliminate the porosities remarkably, so as to improve the relative density of the alloy to 99.5%. The microstructures of Al-27%Si experience further improvement after certain heat treatments, while the transformations of mechanical properties are opposite.

 

Key words: spray deposition; Al-27%Si alloy; hot extrusion; heat treatments; microstructures; yield strength

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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