当前位置：首页 > 过刊浏览->2023年44卷第3期
烧结温度对CoCrFeNi高熵合金微观组织和 力学性能的影响
Effect of Sintering Temperature on the Microstructure and Mechanical Properties of a CoCrFeNi High-entropy Alloy
浏览(3061) 下载(17)
- DOI:
- 作者:
- 王 楠 1 ，罗时峰 1 ，杨光昱 2 ，李 响 1 ，王 衍 1 ，程和法 1 ，杨新宇 1 ，张久兴 1
WANG Nan1 , LUO Shifeng1 , YANG Guangyu2 , LI Xiang1 , WANG Yan1 , CHENG Hefa1 , YANG Xinyu1 , ZHANG Jiuxing1
- 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、1 000、1 050、1 100 ℃5 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，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 1 050 ℃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 1 050 ℃，其抗拉强度、屈服强度和断裂伸长率分别为663、383 MPa 和 60.7%。CoCrFeNi high-entropy alloys were fabricated by spark plasma sintering with a sintering pressure of 40 MPa andsintering time of 10 min at 900, 950, 1 000, 1 050 and 1 100 ℃. The effects of sintering temperature on the microstructureand mechanical properties of the CoCrFeNi high-entropy alloy were investigated by characterizing the phase,microstructure, relative density, microhardness and tensile properties. The results show that sintered CoCrFeNi high-entropyalloys exhibit a single FCC phase at all sintering temperatures. With increasing sintering temperature, the relative densityincreases gradually, and the sample is densified completely at 1 050 ℃. The mechanical properties of CoCrFeNi alloys firstincrease and then decrease with increasing sintering temperature. The CoCrFeNi high-entropy alloy obtains optimalmechanical properties at a sintering temperature of 1 050 ℃, with an ultimate tensile strength of 663 MPa, a yield tensilestrength of 383 MPa and an elongation to fracture of 60.7%.