添加微量Y对ZL205A合金组织和性能的影响

发布时间：2018-04-14 22:17

本文选题：ZLA合金 + 流动性　；参考：《稀有金属材料与工程》2015年09期

【摘要】：采用OM、SEM和XRD研究了添加微量稀土元素Y对ZL205A合金的流动性及T6热处理前后的微观组织和力学性能的影响,并检测了合金的流动性。结果表明,当Y质量分数达到0.2%和0.3%时,合金的晶粒细化效果相对较好,随着Y含量的增加,θ相从沿着晶界的网状分布逐渐向局部团聚,合金的抗拉强度和屈服强度降低;微量Y会使ZL205A合金的流动性降低;Y质量分数为0.3%的ZL205A合金在T6处理后,合金的抗拉强度和延伸率均大幅度提高;热处理能够降低合金中的成分偏析并能够改善材料的组织形态,促使合金具有相对较好的综合力学性能;添加微量Y以后,晶界上的难熔化合物Al Cu Y促使晶粒内部的θ相数量减少,是造成合金力学性能降低的重要原因。
[Abstract]:The effects of adding trace rare earth element Y on the fluidity, microstructure and mechanical properties of ZL205A alloy before and after heat treatment were studied by XRD and OMSEM. The fluidity of the alloy was also measured.The results show that when the mass fraction of Y reaches 0.2% and 0.3%, the grain refinement effect of the alloy is relatively good. With the increase of Y content, the distribution of 胃 phase gradually changes from the net distribution along the grain boundary to local agglomeration, and the tensile strength and yield strength of the alloy decrease.After T6 treatment, the tensile strength and elongation of the ZL205A alloy increased greatly, and the heat treatment decreased the segregation of the components and improved the microstructure of the ZL205A alloy, which decreased the fluidity of the alloy, decreased the fluidity of the alloy and decreased the tensile strength and the elongation of the ZL205A alloy with 0.3wt% of Y content after T6 treatment.The addition of a small amount of Y, the refractory compound Al Cu Y at the grain boundary, can reduce the number of 胃 phases in the grain, which is an important reason for the decrease of mechanical properties of the alloy.
【作者单位】：兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室;长风电子科技有限责任公司;
【基金】：有色金属先进加工与再利用国家重点实验室开放基金(SKL1303) 甘肃省科技重大专项计划(1302GKDA015)
【分类号】：TG146.21

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