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粉末冶金材料科学与工程  2023, Vol. 28 Issue (5): 448-455    DOI: 10.19976/j.cnki.43-1448/TF.2023050
  工艺技术 本期目录 | 过刊浏览 | 高级检索 |
退火处理对粉末冶金CoCrFeNiC0.05高熵合金热轧板显微组织和力学性能的影响
张扬帆1, 周睿2, 陶慧1, 李慧中1,3, 梁霄鹏1,3
1.中南大学 材料科学与工程学院,长沙 410083;
2.香港城市大学 材料科学与工程系,香港 999077;
3.中南大学 有色金属材料科学与工程教育部重点实验室,长沙 410083
Effects of annealing on microstructure and mechanical properties of powder metallurgy hot rolled CoCrFeNiC0.05 high-entropy alloy sheet
ZHANG Yangfan1, ZHOU Rui2, TAO Hui1, LI Huizhong1,3, LIANG Xiaopeng1,3
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong 999077, China;
3. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China
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摘要 以Cr、Co、Fe、Ni单质块体和Cr3C2为原料,采用气雾化法制备预合金粉,通过热等静压法制备CoCrFeNiC0.05高熵合金,对合金进行热轧和退火处理,结合X射线衍射、金相显微镜、扫描电子显微镜、透射电子显微镜、电子背散射衍射、硬度测试和拉伸性能测试等手段,研究退火处理对粉末冶金CoCrFeNiC0.05高熵合金热轧板显微组织和力学性能的影响。结果表明:热轧变形后,合金晶粒形态由热等静压的等轴状转变为条带状,织构组态以F织构为主,晶内存在孪晶和亚微米级Cr23C6碳化物。经800 ℃退火处理后,合金发生完全再结晶。热轧结合中温退火(500 ℃)是获得具有良好综合力学性能CoCrFeNiC0.05高熵合金的有效途径,合金的屈服强度为961 MPa,抗拉强度为1 023 MPa,伸长率为13.6%。
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张扬帆
周睿
陶慧
李慧中
梁霄鹏
关键词 高熵合金热轧退火力学性能显微组织    
Abstract:The pre-alloyed powder was prepared by gas atomization method with Cr, Co, Fe, Ni simple substance and Cr3C2 as raw materials. CoCrFeNiC0.05 high-entropy alloy was prepared by hot isostatic pressing, and the alloy was hot rolled and annealed. The effects of annealing on the microstructure and mechanical properties of powder metallurgy hot rolled CoCrFeNiC0.05 high-entropy alloy sheet were systematically studied by X-ray diffraction, optical microscope, scanning electron microscope, transmission electron microscope, electron backscatter diffraction, Vickers hardness, and tensile testing. The results show that the grains are equiaxed in hot isotactic pressed alloy but transform to elongated morphology after hot rolling. The hot rolled sheet exhibits a strong F-type texture, and twins and submicron Cr23C6 typed carbide are observed. After annealing treatment at 800 ℃, the alloy undergoes complete recrystallization. Hot rolling combining with moderate temperature annealing (500 ℃) is an effective approach to achieving good comprehensive mechanical properties for CoCrFeNiC0.05 high-entropy alloy, with yield strength of 961 MPa, tensile strength of 1 023 MPa, and elongation of 13.6%.
Key wordshigh-entropy alloy    hot rolling    annealing    mechanical property    microstructure
收稿日期: 2023-05-05      出版日期: 2023-11-22
ZTFLH:  TG146  
基金资助:中南大学研究生创新项目资助(2022XQLH097)
通讯作者: 梁霄鹏,教授,博士。电话:0731-88877949;E-mail: xpliang@csu.edu.cn   
引用本文:   
张扬帆, 周睿, 陶慧, 李慧中, 梁霄鹏. 退火处理对粉末冶金CoCrFeNiC0.05高熵合金热轧板显微组织和力学性能的影响[J]. 粉末冶金材料科学与工程, 2023, 28(5): 448-455.
ZHANG Yangfan, ZHOU Rui, TAO Hui, LI Huizhong, LIANG Xiaopeng. Effects of annealing on microstructure and mechanical properties of powder metallurgy hot rolled CoCrFeNiC0.05 high-entropy alloy sheet. Materials Science and Engineering of Powder Metallurgy, 2023, 28(5): 448-455.
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