时效处理对(FeNiCoCr)90Al5Ti5高熵合金L12型析出相及力学性能的影响
Effect of aging treatment on L12 precipitated phase and mechanical properties of(FeNiCoCr)90 Al5Ti5 high entropy alloy
孛海娃 1王沛锦 1艾桃桃1
作者信息
- 1. 陕西理工大学 材料科学与工程学院,陕西 汉中 723000;陕西理工大学 矿渣综合利用环保技术国家地方联合工程实验室,陕西 汉中 723000
- 折叠
摘要
析出相形态和相稳定性对于调控合金力学性能至关重要.采用低速球磨+热压烧结法制备(FeNiCoCr)90Al5Ti5高熵合金,研究高温(1150℃)和中温(850℃)时效处理对合金析出相类型、形貌、分布及力学性能的影响.结果表明:所制备合金压缩应变量达47%,屈服强度和极限抗压强度分别为948 MPa和1684 MPa,高强度源于晶内L12结构纳米析出相的强化作用.850℃时效10 h后L12析出相长大为尺寸超过10 μm的等轴晶粒,且部分转变为薄片状HCP结构η相,导致合金屈服强度和极限抗压强度降低.1150℃时效2 h后晶内纳米L12析出相完全回溶,导致合金屈服强度和极限抗压强度急剧降低.
Abstract
The morphology and phase stability of precipitated phases are essential for regulating mechanical properties of alloys.The(FeNiCoCr)90Al5Ti5 high entropy alloy was prepared by low-speed ball milling and hot-press sintering method,and the effects of high-temperature(1150℃)and medium-temperature(850℃)aging treatment on the types,morphology,distribution and mechanical properties of precipitated phases in the alloy were investigated.The results show that the compressive strain of the prepared alloy reaches 47%,and the yield strength and ultimate compressive strength are 948 MPa and 1684 MPa,respectively.The high strength is due to the strengthening effect of the L12 structure nano-precipitation phases within the crystal.After aging at 850℃for 10 h,the L12 precipitated phases grow into equiaxed grains with a size exceeding 10 μm,and some of them transform into a thin lamellar HCP structure η phases,which leads to the decrease of the yield strength and ultimate compressive strength of the alloy.After aging at 1150℃for 2 h,the intracrystalline L12 nano-precipitated phases completely redissolve,which leads to a drastic decrease in the yield strength and ultimate compressive strength of the alloy.
关键词
高熵合金/析出相/时效处理/压缩性能Key words
high entropy alloy/precipitated phase/aging treatment/compression property引用本文复制引用
基金项目
陕西省自然科学基础研究计划项目(2023-JC-ZD-22)
出版年
2024
国家科技期刊平台
NSTL
万方数据