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烧结温度对CoCrFeNi高熵合金微观组织和力学性能影响
Effect of Sintering Temperature on Microstructure and Mechanical Properties of CoCrFeNi High-entropy Alloy
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- DOI:
- 作者:
- 王 楠,罗时峰,杨光昱,李 响,王 衍,程和法,杨新宇,张久兴
WANG Nan, LUO Shifeng, Yang Guangyu, LI Xiang, WAN
- 作者单位:
- 1.合肥工业大学 材料科学与工程学院,安徽 合肥 230009;2.西北工业大学 凝固技术国家重点实验室,陕西 西安 710072
1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; 2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
- 关键词:
- CoCrFeNi高熵合金;烧结温度;微观组织;力学性能
CoCrFeNi high-entropy alloy; sintering temperature; microstructure; mechanical properties
- 摘要:
- 采用放电等离子烧结工艺,烧结压力为40 MPa,烧结时间为10 min,分别在900、950、1000、1050、1100 ℃五个烧结温度制备了CoCrFeNi高熵合金。通过表征样品的物相、微观组织、致密度、显微硬度和拉伸性能等,研究了烧结温度对CoCeFeNi高熵合金的微观组织和力学性能的影响。结果表明,烧结态CoCrFeNi高熵合金均表现为单相FCC结构,合金的致密度随烧结温度的升高而逐渐升高,至1050 ℃时接近完全致密。合金的力学性能随烧结温度的升高呈现先上升后下降的趋势。CoCrFeNi高熵合金的最佳烧结温度为1050 ℃,其抗拉强度、屈服强度和断裂延伸率分别为663 MPa、383 MPa和60.7%。
CoCrFeNi high-entropy alloys were fabricated by spark plasma sintering with the sintering pressure of 40 MPa and sintering time of 10 min at 900, 950, 1 000, 1 050 and 1 100 ℃, respectively. The effects of sintering temperature on microstructure and mechanical properties of CoCrFeNi high-entropy alloy were investigated by characterizing the phase, microstructure, relative density, microhardness and tensile properties. The results show that sintered CoCrFeNi high-entropy alloys exhibit the single FCC phase at all sintering temperatures. With the increase of sintering temperature, the relative density increases gradually, and the sample is densified completely at 1050 ℃. With increasing the sintering temperature, mechanical properties of CoCrFeNi alloys increase firstly, and then decreases. The CoCrFeNi high-entropy alloy obtains the optimal mechanical properties at the sintering temperature of 1050 ℃, with the ultimate tensile strength of 663 MPa, the yield tensile strength of 383 MPa and the elongation to fracture of 60.7% respectively.