摘要
难熔高熵合金(RHEA)由于其优异的高温力学性能,近年来备受关注。然而,室温延展性差和密度高仍然是限制其工业应用的主要因素。通过机械合金化和放电等离子烧结组合工艺,制备出理论密度仅为7.708g/cm^(3)的Ti_(60)Nb_(12)Mo_(12)Ta_(12)W_(4)难熔高熵合金。研究了烧结温度对合金组织和力学性能的影响。结果表明:合金相结构由BCC相(BCC1相和BCC2相)和极少量FCC析出相组成。在室温条件下,经1600℃烧结的合金获得最高的压缩峰值应力和最佳塑性(2542MPa和9.8%),同时该合金在1000℃压缩时仍保持较高压缩性能,最高峰值应力可达到419MPa。本研究将为RHEA的制备、表征及进一步的工业应用提供参考。
Refractory high-entropy alloys (RHEA) have attracted much attention in recent years due to their excellent high-temperature mechanical properties.However,poor room-temperature ductility and high density are still the main factors that limit its industrial applications.A Ti_(60)Nb_(12)Mo_(12)Ta_(12)W_(4) refractory high-entropy alloy with a theoretical density of only 7.708g/cm^(3) is prepared by a combination of mechanical alloying and discharge plasma sintering.The effects of sintering temperature on the microstructure and mechanical properties of the alloy are studied.The results show that the alloy phase structure is composed of BCC phase (BCC1 phase and BCC2 phase)and a very small amount of FCC precipitated phase.At room temperature,the alloy sintered at 1600℃obtains the highest compressive peak stress and the best plasticity (2542MPa and 9.8%),while the alloy still maintains high compressive performance at 1000℃,and the highest peak stress can reach 419MPa.This study will provide some reference for the preparation,characterization,and further industrial application of RHEA.
作者
赵佳雨
陈子瑞
高卓
王李垣
崔冠华
范智渊
石晓辉
ZHAO Jiayu;CHEN Zirui;GAO Zhuo;WANG Liyuan;CUI Guanhua;FAN Zhiyuan;SHI Xiaohui(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)
基金
山西省高等学校教学改革创新项目(J20240312)
山西省大学生创新创业训练计划项目(20220119)。
关键词
难熔高熵合金
显微组织
力学性能
低密度
refractory high-entropy alloy
microstructure
mechanical properties
low density
作者简介
第一作者:赵佳雨,学士,硕士研究生,主要研究方向为钛合金、高熵合金、车轮钢等金属材料,E-mail:2077659005@qq.com;通信作者:石晓辉,副教授、硕士研究生导师,主要从事钛合金、高熵合金、车轮钢等方面的研究工作,E-mail:sxhtough@126.com。
