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TiVTa系低活化多主元合金的微观结构及相稳定性

Microstructure and phase stability of TiVTa-based low-activation,multi-principal-element alloys
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摘要 制约可控核聚变堆商业化运用的关键问题之一是面向等离子体材料(plasma facing materials,PFMs),难熔多主元合金因其高温高强度、高熔点及良好的耐辐照性有望满足PFMs的需求。本工作设计并采用电弧熔炼制备了(TiVTa)_(95)X_(5)(X=Cr,Zr,W)低活化多主元合金,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及能量色散X射线谱仪(EDS)研究了Cr,Zr和W的添加对铸态、匀质TiVTa系合金的微观结构及900℃下相稳定性的影响。结果表明,铸态合金均为具有体心立方(BCC)结构的简单固溶体,经1200℃匀质化处理后(TiVTa)_(95)Cr_(5)合金发生相分解,基体内出现少量C15_Laves第二相。900℃下TiVTa系合金相稳定性不佳,均分解为一个BCC主相和沿晶界分布的C15_Laves第二相,TiVTa和(TiVTa)95 W 5合金中第二相体积分数较小,Cr,Zr的添加加剧相分解。经相结构及元素分析发现,(TiVTa)_(95)X_(5)(X=Cr,Zr,W)合金中析出的C15_Laves相晶格常数及元素组成均与二元合金体系中可能存在的Laves相不一致,差异主要来源于Laves相的元素组成。 One of the key problems restricting the commercial application of controllable nuclear fusion reactors is plasma facing materials(PFMs).As the most promising PFMs,there are still many problems in the applications of tungsten and tungsten alloys.Due to their high strength at elevated temperatures,high melting point and good irradiation resistance,refractory multi-principal-element alloys are expected to meet the needs of PFMs.In the present study,(TiVTa)_(95)X_(5)(X=Cr,Zr,W)was designed and manufactured by using arc-melting.The effects of the addition of Cr,Zr and W on the microstructure and phase stability at 900℃of TiVTa-based alloys were investigated by XRD,SEM and EDS.The results show that as-cast TiVTa-based alloys are simple solid solutions with BCC structure.After homogenization treatment at 1200℃,phase decomposition occurs in the(TiVTa)_(95)Cr_(5)alloy,and a small amount of second phase C15_Laves appears in the matrix.At 900℃,TiVTa-based alloys are all decomposed into a BCC main phase and a C15_Laves second phase which mainly distributed along the grain boundaries,and the volume fraction of the second phase in TiVTa and(TiVTa)95 W 5 alloys is small whereas the addition of Cr and Zr intensifies the phase decomposition.After phase structure and elemental analysis,the lattice constant and elemental composition of the precipitated C15_Laves phases in(TiVTa)_(95)X_(5)(X=Cr,Zr,W)alloys are inconsistent with the possible Laves phase in the binary alloy system,and the difference is mainly attributed to the elemental composition of the Laves phase.
作者 李顺 张周然 郑昆鹏 卢书晴 唐宇 白书欣 LI Shun;ZHANG Zhouran;ZHENG Kunpeng;LU Shuqing;TANG Yu;BAI Shuxin(Department of Materials Science and Engineering,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)
出处 《材料工程》 EI CAS CSCD 北大核心 2023年第8期181-189,共9页 Journal of Materials Engineering
基金 国家自然科学基金项目(52171166) 国防科技大学种子基金项目(202218)。
关键词 TiVTa 低活化难熔合金 多主元合金 相稳定性 TiVTa low activation refractory alloys multi-principal element alloys phase stability
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