Mg-13Gd-2Nd-2Cu合金的显微组织与力学性能

发布时间：2018-03-22 00:24

  本文选题：稀土镁合金　切入点：退火温度　出处：《中国稀土学报》2017年03期 　论文类型：期刊论文

【摘要】：通过熔炼铸造及热挤压方法制备了Mg-13Gd-2Nd-2Cu(质量分数)镁合金。通过金相显微镜、扫描电镜及能谱分析、维氏硬度、拉伸性能测试等方法,研究了Mg-13Gd-2Nd-2Cu合金的铸态显微组织特征及退火温度对挤压态合金的组织与力学性能影响。结果表明:退火热处理促进了晶界处Mg5(GdNdCu)_1相充分溶入α-Mg基体中。提高退火温度使基体晶粒发生再结晶长大,改变了Mg5(GdNdCu)_1相的形态和分布。当退火温度超过500℃时,晶粒粗化并部分发生过烧现象。提高退火温度,会使挤压态合金的屈服强度有所降低。
[Abstract]:Mg-13Gd-2Nd-2Cu (mass fraction) magnesium alloy was prepared by melting casting and hot extrusion. The microstructure characteristics of as-cast Mg-13Gd-2Nd-2Cu alloy and the effect of annealing temperature on the microstructure and mechanical properties of extruded alloy were studied. The results showed that annealing heat treatment promoted the full dissolution of Mg5(GdNdCu)_1 phase into 伪 -Mg matrix at grain boundary, and the annealing temperature was raised. Recrystallization and growth of the matrix grain, The morphology and distribution of Mg5(GdNdCu)_1 phase were changed. When the annealing temperature was higher than 500 鈩，

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