摘要
针对稀土元素在TiAl合金中的微合金化作用进行了研究,采用高真空电弧熔炼技术制备了Ti-48Al-3Nb-2V-X(Nd,Pr)(X=0,0.1,0.5,1.0,2.0)合金钮扣铸锭,通过金相显微镜(OM)、扫描电镜(SEM)、能谱分析(EDS)等手段表征了铸态、热等静压态、退火态合金的相组成及显微组织。结果表明:添加Nd、Pr后,铸态合金的显微组织明显细化,热等静压态合金在连续冷却转变过程中的组织变化不明显,但冷却速度对组织有显著影响。炉冷后形成双态组织,空冷后α→γm块状反应抑制片层结构形成,水冷后形成均匀的全层片组织。经过1400℃+20 min热处理,在冷速较低时易形成NdO氧化物,冷速较高时易形成Al2Nd、Al3Nd等铝化物,有望对TiAl合金进行高温强化。
The paper investigated the microalloying effect of rare earth elements in TiAl alloys.The Ti-48Al-3Nb-2V-X(Nd,Pr)(X=0,0.1,0.5,1.0,2.0)alloy button ingots were prepared by high-vacuum arc melting technique.The phase composition and microstructure of the alloys in as-cast,hot isostatic pressed and annealed states were characterized using metallurgical microscope(OM),scanning electron microscope(SEM),and energy spectroscopic analysis(EDS).The results showed that after adding Nd and Pr,the microstructure of the as-cast alloy was significantly refined,and the microstructure change of the hot isostatic state alloy was not obvious during the continuous cooling transformation,whereas the cooling rate had a major impact on it.The duplex microstructure was formed after furnace cooling,while theα→γm bulk reaction suppressed the formation of lamellar microstructure after air cooling.Water cooling resulted in a uniform fully lamellar microstructure.After heat treatment at 1400℃+20 min,NdO oxides were easily formed at lower cooling rate,whereas aluminides such as Al2Nd and Al3Nd were easily formed at higher cooling rate.This provides a reference to strengthen TiAl alloy at high temperatures.
作者
沙逢源
荣川
杨劼人
刘颖
邢辉
李志强
SHA Fengyuan;RONG Chuan;YANG Jieren;LIU Ying;XING Hui;LI Zhiqiang(School of Materials Science and Engineering,Sichuan University,Chengdu 610000,China;Ministry of Education Key Laboratory of Space Applied Physics and Chemistry,Northwestern,Polytechnical University,Xi'an 710129,China;Bayan Obo National Key Laboratory of Rare Earth Resources Research and Comprehensive Utilization,Baotou Rare Earth Institute,Baotou,Inner Mongolia 014030,China)
出处
《内蒙古工业大学学报（自然科学版）》
2024年第5期443-452,共10页
Journal of Inner Mongolia University of Technology：Natural Science Edition
基金
白云鄂博稀土资源研究与综合利用全国重点实验室基金项目
四川省重点科技专项项目(23ZDZX0031)
四川省重点研发项目(2023YFG0216)。
