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退火温度对 Al-Co-Fe-Ni 共晶高熵合金组织性能的影响
Effect of Annealing Temperature on the Microstructure and Properties ofAl-Co-Fe-Ni Eutectic High-entropy Alloy
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- DOI:
- 作者:
- 聂 帅 1，2，3，刘浩翔 1，2，3，武宇浩 1，2，3，刘栩东 1，2，3，贺一轩 1，2，3，
NIE Shuai1,2,3, LIU Haoxiang1,2,3, WU Yuhao1,2,3, LIU Xudong1,2,3, HE Yixuan1,2,3,WANG Jun1, LI Jins
- 作者单位:
- 1. 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072；2. 西北工业大学 上海闵行协同创新中心，上海201108；3. 西北工业大学 先进密封材料与润滑研究中心，陕西 西安 710072
1. State Key Laboratory of Solidification Processing , Northwestern Polytechnical University , Xi'an 710072 , China ;2. Collaborative Innovation Center of NPU, Shanghai 201108, China; 3. Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- 共晶高熵合金；退火温度；力学性能；相变表征；变形机制
eutectic high-entropy alloy; annealing temperature; mechanical properties; phase transformation characteristics; deformation mechanism
- 摘要:
- 良好的延展性是合金成形能力的重要影响因素，尽管共晶高熵合金具有良好的铸造性能，但有限的延展性限 制 了 其 实 际 应 用 。 本 文 采 用 热 轧 和 退 火 工 艺 来 克 服 共 晶 高 熵 合 金 这 一 问 题 ， 探 究 热 轧 后 不 同 退 火 温 度 对Al21.5Co19.5Fe9.5Ni50 共晶高熵合金微观组织和力学性能的影响。 结果表明，当退火温度为 700 ℃时，合金的断裂强度和断裂伸长率达到最优，分别为 1 211 MPa 和 14%。 其优异强塑性匹配来自于热轧 -700 样品在拉伸变形过程中，FCC 相内出现大量位错并在相界面处堆积，B2 相由于相界面处的高局部应力导致应力诱发马氏体相变转变 L10 孪晶马氏体，合金产生了 TRIP 效应，使其达到最优的强塑性匹配。Excellent ductility is a critical factor influencing the formability of alloys. While eutectic high-entropy alloysexhibit good casting performance, their limited ductility limits their practical application. Therefore, hot rolling andannealing processes were utilized to address the ductility issue of eutectic high-entropy alloys, and the impact of differentannealing temperatures following hot rolling on the microstructure and mechanical properties of the Al21.5Co19.5Fe9.5Ni50eutectic high-entropy alloy was investigated. The findings indicate that at an annealing temperature of 700 ℃, the alloyachieves optimal fracture strength and elongation at break values of 1 211 MPa and 14% , respectively. The superiorstrength and plasticity combination is attributed to the emergence of a significant number of dislocations in the FCC phaseand their accumulation at the phase interface during the tensile deformation process of the hot-rolled 700 sample. The highlocal stress at the phase interface in the B2 phase induces stress-induced martensitic transformation into L10 twinmartensite, enabling the alloy to exhibit a TRIP effect, thereby achieving an optimal strength and plasticity balance.