新型轻质TiAlBeSc系合金的组织及性能  

Microstructure and Performance of TiAlBeSc Alloys with Low Density

作　　者：李兰[1] 黄粒[1] 宋西平[1] 叶丰[1] 林均品[1] 陈国良[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2012年第5期826-829,共4页Rare Metal Materials and Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(FRF-TP-09-026B)

摘　　要：采用真空电弧炉熔炼制备新型轻质TiAlBeSc系合金,最小密度为3.289g/cm3,利用SEM(EDS)、XRD、纳米力学探针和DTA等分析方法对合金的显微组织和热稳定性进行分析研究。结果表明,TiAlBeSc系合金形成稳定的金属间化合物和固溶体,1000℃以下加热过程中不发生相变,熔点均高于1100℃,具有很高的热稳定性。合金元素等摩尔比配比时,25%铍(原子分数)全部固溶于钪的点阵晶格,L10正方有序结构的TiAl相呈树枝状均匀分布于α-Sc的基体上,硬度高达7330MPa,具有良好的综合力学性能。A new-type of low density TiAlBeSc alloy system was prepared by vacuum arc melting.The lowest density is 3.289 g/cm3.Its microstructures,thermal stability were studied using SEM（EDS）,XRD,nanoindentation and DTA methods.The results show that the TiAlBeSc alloy system forms stable intermetallic compound and solid solution.No transformation occurs below 1000 °C.These alloys exhibit a very high thermal stability with a melting point above 1100 °C.For the equimolar TiAlBeSc alloy,25%（atomic percentage） beryllium is totally dissolved in scandium lattice.The dendritic TiAl phase with L10 ordered structure is uniformly distributed in α-Sc matrix which exhibits excellent mechanical properties with hardness 7330 MPa.

关 键 词：TiAlBeSc 轻质合金 金属间化合物 固溶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]