摘要
为提升定向凝固FCC/B_(2)双相高熵合金在宽温域下的综合力学性能,本文基于不同热处理工艺开展了组织调控研究,通过测试其宽温域下的力学性能与表征断口表面,明确不同热处理工艺下的组织演化机理并分析揭示组织特征对合金力学性能的影响机制。结果表明,固溶后进行先高温800℃再低温650℃的双级时效处理,可在FCC基体内获得高密度近球形L1_(2)析出相,同时在B_(2)相内得到板条状的L1_(2)相。高密度的L1_(2)析出相有效强化合金的性能,且L1_(2)相可促进B_(2)相内的位错运动,有利于提升合金的塑性。相比于铸态,经过热处理后的合金高温力学性能得到明显提升。
In this study,the microstructures of the directionally solidified FCC/B_(2)dual-phase high-entropy alloy were tailored based on different heat treatment processes to improve the mechanical properties in a wide temperature range.The microstructure evolution mechanism under different heat treatment regimes was clarified,and the influence of microstructures on the mechanical properties of the alloy was analyzed.The results show that high-density near spherical L1_(2)precipitates can be obtained in the FCC matrix,while lath-like L1_(2)precipitates can be obtained in the B_(2)phase after solution treatment followed by double aging at high-temperature 800℃and low-temperature 650℃.High-density precipitates effectively strengthen the alloy,and the L1_(2)phase can promote dislocation movement in the B_(2)phase,which is beneficial to improve the plasticity of the alloy at the same time.Compared to the as-cast sample,the comprehensive high-temperature mechanical properties of the alloy after heat treatment are improved.
作者
王立斐
严鹏
刘林翔
王祯
许骏杰
赵婉蓉
王志军
WANG Lifei;YAN Peng;LIU Linxiang;WANG Zhen;XU Junjie;ZHAO Wanrong;WANG Zhijun(Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Northwestern Polytechnical University,Xi’an 710072,China)
出处
《航空制造技术》
CSCD
北大核心
2024年第23期80-87,共8页
Aeronautical Manufacturing Technology
关键词
定向凝固
高熵合金
热处理
高温力学性能
微观组织表征
Directional-solidification
High-entropy alloys
Heat treatment
High-temperature mechanical properties
Microstructural characterization
