Al-(0.2-x)Si-xYb-0.04Zr合金的时效行为和导电性  

Aging Behavior and Electrical Conductive Properties of Al-(0.2-x)Si-xYb-0.04Zr Alloys

作　　者：魏瑞启 陈雪姣[1] 王裕[1] 蔡彬[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室

出　　处：《特种铸造及有色合金》2017年第7期800-803,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51371160)

摘　　要：利用Yb部分替换Al-0.2Sc-0.04Zr合金中Sc,通过对其室温硬度、拉伸性能和电阻率测试,研究了Al-(0.2-x)Si-xYb-0.04Zr合金的力学性能和导电性能。结果表明,合金具有明显的时效强化行为。Yb含量为0.05%、0.10%和0.15%的合金峰时效温度在330℃附近,而不含Sc的Al-0.2Yb-0.04Zr合金峰时效温度在280℃;相应的峰时效态抗拉强度分别为155、140、104和85 MPa。Yb(部分)替代Sc虽然降低了Al-0.2Sc-0.04Zr合金的力学性能,但提高了其导电性。综合力学、电学性能,尤其是成本因素发现,Al-0.1Sc-0.1Yb-0.04Zr合金在耐热导电材料领域最具应用前景。In order to reduce the cost of Al-0.2Sc-0.04Zr electric alloys, the effects of （partially） substi- tuting of Sc by Yb on the ageing behavior and electrical conductive properties of Al-（0.2--x）Si-xYb-0. 04Zr alloys were investigated by hardness, tensile and electrical conductivity tests. It is found that all al- loys exhibit an apparent ageing-hardening peak. The peak ageing temperatures of alloys containing 0.05%, 0.10% and 0.15% Yb are all about 330 ℃, while that of alloy containing 0.20% Yb is 280 ℃. The corresponding tensile strengths at peak-ageing reach 155, 140, 104 and 85 MPa, respectively. The （partially） substituting of Sc by Yb for Al-0.2Sc-0.04Zr alloy can improve the electrical conductive al- though it can result in the decrease of the mechanical properties. Based on the mechanical and electrical properties, especially the production cost, the Al-0.1Sc-0.1Yb-0.04Zr alloy has the desirable application prospects at the field of heat-resistant electrical conductive materials.

关 键 词：Al-Sc-Yb-Zr合金 时效 力学性能 电导率 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]