Mo含量对激光立体成形Ti-6Al-Mo系合金组织及硬度的影响(英文)  

Influence of Mo Content on Microstructure and Microhardness of Laser Solid Formed Ti-6Al-Mo System Alloys

作　　者：张凤英[1] 陈宏[1] 徐义库[1] 张学敏[1] 

机构地区：[1]长安大学,陕西西安710064

出　　处：《稀有金属材料与工程》2013年第7期1332-1336,共5页Rare Metal Materials and Engineering

基　　金：Fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201102);National Natural Science Foundation of China (51105311)

摘　　要：以混合 Ti、Al、Mo 元素粉末为原料制备新型 Ti-6Al-yMo (3≤y≤11)合金,并研究了合金沉积层的显微组织及硬度。结果发现:随着 Mo 含量的增加,合金沉积层的初生α束域体积分数逐渐减小,同时 Ti-6Al-yMo 合金的组织逐渐由魏氏组织转变为网篮组织形态,初生α相的尺寸和长宽比均随着 Mo 含量的增加而减小,次生α相的体积分数随着 Mo 含量的增加而增大。对激光多层沉积 Ti-6Al-yMo 合金的显微硬度进行了测试,结果发现:在所采用的合金成分范围内,Mo 含量小于 11%时,随着 Mo 含量的增加,激光多层沉积 Ti-6Al-yMo 合金沉积态的硬度几乎呈线性增加。The novel Ti-6Al-yMo （3≤y≤11） titanium alloys were deposited from blended Ti, Al and Mo powders using the laser solid forming （LSF） process and the microstructure and hardness of as-deposited layers were investigated. Results show that the volume fraction of the prior a colony decreases and the microstructure changes from widmanstaitten structure to basketweave structure with the increase of Mo content. Meanwhile, the average size and aspect ratio of the prior a lath decrease and the volume fraction of the secondary a laths increases with the increase of Mo content. The microhardness of as-deposite layers was also measured, and it is found that the hardness of as-deposited Ti-6Al-yMo alloys increases predominantly linearly with the increase of the Mo content until 11 wt% Mo.

关 键 词：激光立体成形 混合元素粉 Ti-Al-Mo合金 组织 

分 类 号：TF125[冶金工程—粉末冶金]