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
Effects of annealing on microstructure and mechanical properties of powder metallurgy hot rolled CoCrFeNiC0.05 high-entropy alloy sheet
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | Chinese (Simplified) |
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Pages (from-to) | 448-455 |
Journal / Publication | 粉末冶金材料科学与工程 |
Volume | 28 |
Issue number | 5 |
Publication status | Published - Oct 2023 |
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Abstract
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%。
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%. © 2023 Central South University. All rights reserved.
Research Area(s)
- annealing, high-entropy alloy, hot rolling, mechanical property, microstructure, 高熵合金, 热轧, 退火, 力学性能, 显微组织
Citation Format(s)
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; 周睿; 陶慧 et al.
In: 粉末冶金材料科学与工程, Vol. 28, No. 5, 10.2023, p. 448-455.
In: 粉末冶金材料科学与工程, Vol. 28, No. 5, 10.2023, p. 448-455.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review