Ti/Al合金化对U-5.5Mo合金组织与力学性能的影响  

Effect of Ti/Al Alloying on Microstructure and Mechanical Properties of U-5.5Mo Alloy

作　　者：王震宏 张立同[1] 邓鸿章[2] 陈冬 Wang Zhenhong;Zhang Litong;Deng Hongzhang;Chen Dong(School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;Institute of Materials,China Academy of Engineering Physics,Jiangyou 621908,China)

机构地区：[1]西北工业大学材料学院,陕西西安710072 [2]中国工程物理研究院材料研究所,四川江油621908

出　　处：《稀有金属材料与工程》2021年第8期2807-2814,共8页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2016YFB0701201)。

摘　　要：采用感应熔炼法在U-5.5Mo合金中引入Ti/Al元素,通过淬火与时效热处理来调控材料的组织与性能,获得不同热处理状态下的U-Mo-Ti/Al合金。分析析出相的组成、分布与性能的关系,探讨Ti/Al合金元素对U-5.5Mo合金力学性能的调控机制。发现在U-5.5Mo合金中加入微量Ti元素对U-Mo合金有明显固溶强化效果,使合金强度大幅提升;低温时效热处理可大幅提升U-Mo-Ti三元合金的力学性能;添加微量Al元素,促使U-Mo-Ti-Al四元合金中形成高温稳定的富钛与富铝的多元复合金属间化合物,其在基体与晶界上呈大量不规则连续分布,对合金具有显著沉淀强化效果,使U-Mo-Ti-Al四元合金的强度大幅提升,而塑性几乎降为零。Ti/Al was introduced into U-5.5Mo alloy by induction melting,and a new alloy U-Mo-Ti/Al was obtained in this way.Its microstructures and properties were controlled by quenching and heat treatment of aging.The relationship between the composition,distribution and properties of precipitates was analyzed,the effect of Ti/Al alloy elements on the mechanical properties of U-5.5Mo alloy was investigated as well.It is found that adding trace element Ti has obvious effect of solution strengthening on the alloy of U-5.5Mo.The mechanical properties of U-Mo-Ti ternary alloy can be greatly improved by low temperature aging.It can promote the formation of stable multi-component intermetallic compounds rich in titanium and aluminum in U-Mo-Ti-Al quaternary alloy under high temperature by adding trace element Al,multitudes of irregular continuous distribution of the trace element in the matrix and grain boundary have significant precipitation strengthening effect on the alloy,as a result,the strengthen of U-Mo-Ti-Al quaternary alloy is greatly improved while the plasticity almost decreases to zero.

关 键 词：时效处理 固溶强化 沉淀强化 力学性能 

分 类 号：TG146.8[一般工业技术—材料科学与工程]