快凝AlCrYZr合金挤压成形与组织性能

添加Y合金化、配制AlCrYZr合金,采用金相、X射线衍射、透射电镜、扫描电镜、力学拉伸实验等研究手段,研究了快速凝固AlCrYZr合金粉末挤压成形工艺以及其对组织性能的影响。结果表明,实验合金中主要第二相为Al₂₀Cr₂Y(立方,a=1.44nm)和Al₃Zr;挤压成形时提高挤压比,降低挤压温度,有利于改善粉体结合状况,得到Ll₂Al₃Zr质点,同时细化Al₂₀Cr₂Y质点,使合金获得动态回复组织,从而使合金具有良好的低温、高温强度和塑性。

EXTRUSION FORMING OF RAPIDLY SOLIDIFIED AlCrYZr ALUMINUM ALLOYS AND THEIR MICROSTRUCTURES AND TENSILE PROPERTIES

An AlCrYZr aluminum alloy was made up by adding alloy element yttrium. By using of optical microscopy, x-ray diffration, transsion electron microscopy, scanning eletron microscopy and tensile test, extrusion forming process of rapidly solidified powder of AlCrYZr aluminum alloy was studied and its effect on microstrutures and mechanical properties of the alloys were investigated. The results show, the main second phase of the testing alloy are Al 20 Cr 2Y(Cubic, a= 1.44 nm)and DO 23 Al 3Zr,and to increase extrusion ratio and lower extrusion temperature during extrusion forming is benificial for improving binding state of powder, obtaining Ll 2Al 3Zr precipitated particle and making Al 20 Cr 2Y particle fine and then getting dynamic recovery microstructure in the aluminum matrix, therefore, the alloy prepared by using a suitable consolidation roue has good strength and plasticity at room temperature and evelated temperature.