La＋Ce混合稀土对6201铝合金微观组织的影响

Effect of La + Ce mischmetal on microstructure of 6201 aluminum alloy

研究了微量La+Ce混合稀土对6201铝合金导体材料微观组织的影响。制备了6201铝合金和w(La+Ce)=0.1%混合稀土改性6201铝合金块体材料。采用光学金相显微镜和扫描电子显微镜观察两种铝合金导体材料的微观组织并进行对比分析。采用EDS能谱分析第二相的化学成分。结果表明,少量添加(La+Ce)混合稀土对6201铝合金导体材料的微观组织有一定的影响,微量混合稀土主要影响了Mg2Si相的尺寸和数量。采用显微硬度仪对两种合金的硬度进行了测试,并结合微观组织变化对结果进行了分析。测试结果表明,混合稀土使6201铝合金硬度略微下降,应归因于稀土元素对α-Al中析出的Mg2Si相的尺寸和数量的影响。

The effect of trace La ＋ Ce mischmetal on the microstructure of 6201 aluminum alloy was investigated by manufacturing 6201 aluminum alloy and blocky 6201 aluminum alloy with w （ La ＋ Ce） = 0.1% mischmetal, by comparison of both microstructures with opti- cal microscope and scanning electron microscope, and by EDS analysis of second phase com- positions. The results indicate that the trace amount of La ＋ Ce mischmetal has influence on the microstructure of 6201 aluminum alloy conductor, mainly on the size and amount of the Mg2Si phase. Hardness of both 6201 aluminum alloys was tested by the micro-hardness tester and investigated together with microstructure variation. The results show that the hardness of 6201 aluminum alloy slightly decreases due to the effect of La ＋ Ce mischmetal on the size and amount of Mg2Si precipitated in the α-Al matrix.