Re和C对Ta-10W合金的微观组织和力学性能影响  

Microstructure and Mechanical Properties of Ta-10W Alloy with Re and C Addition

作　　者：何浩天 方金祥 曹阳[2] 王嘉璇 张大斌[2] He Haotian;Fang Jinxiang;Cao Yang;Wang Jiaxuan;Zhang Dabing(School of Mechanical Engineering,Guizhou University,Guiyang 100083,China;College of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Key Laboratory of Advanced Manufacturing Technology of the Ministry of Educating(College of Mechanical Engineering),Guizhou University,Guiyang 550025,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500 [2]贵州大学机械工程学院,贵州贵阳550025 [3]贵州大学现代制造技术教育部重点实验室,贵州贵阳550025

出　　处：《稀有金属》2024年第11期1552-1564,共13页Chinese Journal of Rare Metals

基　　金：国家自然科学基金青年基金项目(51905117);贵州省自然科学基金重点项目(ZK[2021] 053);云南省基础研究计划项目(202201BE070001-059);贵州大学引进人才项目(贵大人基合字(2015)31号)资助

摘　　要：铼(Re)和碳化物陶瓷因其较高的熔点和特殊的耐高温性能,常被用于航空航天领域,改善高温合金的性能。采用电弧熔炼的方法制备了Ta-10W,Ta-10W-4.5Re和Ta-10W-1C难熔合金,讨论了Re和C对Ta-10W合金的微观组织及室温/高温力学性能的影响机制。结果表明,Ta-10W合金为体心立方(bcc)单相固溶体,室温下的屈服强度为810 MPa,断裂应变超过24%,1450℃下的压缩屈服强度为190 MPa。Re(4.5%,质量分数)对Ta-10W合金的物相组成无明显影响,但能够起到细化晶粒的作用,合金的室温屈服强度提高了50.1%,但塑性有所下降,断裂应变为18.4%,1450℃下的屈服强度达430 MPa,提高了126%;当合金中加入C(1%,质量分数)后,合金室温组织变为细小均匀的层状亚共晶组织[bcc+(bcc+Ta_(2)C)],且bcc基体中有弥散析出的针状Ta_(2)C相,合金室温屈服强度提高约18.7%,断裂应变为15.1%,1450℃下的屈服强度提高102%。Ta-10W-4.5Re和Ta-10W-1C两种合金在室温下的压缩断裂应变均超过了15%,在1450℃下的极限抗压强度均超过了400 MPa,在具有优异高温强度的同时,具有良好的室温塑性。With the development of aerospace,nuclear power,petrochemical engineering and other fields,stricter performance requirements are put forward for metal structural materials used at elevated temperature.Ta-based refractory alloys have good room temperature plasticity,but the high temperature mechanical properties of these alloys still need to be further improved.The appropriate amount of Re element has the effect of increasing the recrystallization temperature of the alloy,which significantly improves the high temperature strength without affecting the room temperature plasticity.The addition of a suitable amount of carbide can make the alloy form ahypo-eutectic lamellar structure,which significantly refined the grain and improved the high temperature strength of the alloy.However,too much ceramic phase will seriously deteriorate the room temperature plasticity of the alloy.Ta_(2)C carbide ceramics show good metallicity and plasticity at room temperature,and the ceramic have good mechanical properties at high temperatures.Therefore,it is helpful to improve the high temperature mechanical properties of Ta-based refractory alloys by adding Re element or Ta_(2)C carbide.In addition,there is no related research of Ta_(2)C-reinforced alloys that has been done yet.In this work,the effect of Re(4.5%,mass fraction)and C(1%,mass fraction)on the microstructure and mechanical properties of Ta-10W(Ta:90%;W:10%;mass fraction)alloy was investigated.Ta,W and Re particles and TaC powders with a purity greater than 99.95%were used as raw materials,and the required alloy was prepared by vacuum arc melting.The test samples were prepared by electrical discharge machining(EDM)wire cutting and the microstructure and chemical composition of the samples were investigated using an XD30M optical metallographic microscope(OM)and a ZEISS SUPRA55 scanning electron microscope(SEM)equipped with an energy spectrometer(EDS).The crystal structure of the material was characterized by using a Bruker D8 X-ray diffractometer(XRD)and XRD data were quant

关 键 词：难熔合金 陶瓷增强相 高温力学性能 显微组织 

分 类 号：TG146.41[一般工业技术—材料科学与工程]