(CoCrFeMnNi)97.02Mo2.98高熵合金σ相析出演变及力学性能
收稿日期: 2019-09-29
修回日期: 2019-12-05
网络出版日期: 2019-12-24
基金资助
国家自然科学基金项目(51901167);陕西省教育厅科研专项基金项目(2018JK0396);陕西省自然科学基础研究计划项目(2017JM5057)
Precipitation σ Phase Evoluation and Mechanical Properties of (CoCrFeMnNi)97.02Mo2.98 High Entropy Alloy
Received date: 2019-09-29
Revised date: 2019-12-05
Online published: 2019-12-24
Supported by
National Natural Science Foundation of China(51901167);Shaanxi Provincial Education Department(2018JK0396);Natural Science Basic Research Program of Shaanxi(2017JM5057)
为了研究σ相(CrMo相)对(CoCrFeMnNi)97.02Mo2.98高熵合金力学性能的影响规律，对(CoCrFeMnNi)97.02-Mo2.98高熵合金进行退火热处理，利用SEM、EDS、XRD等方法分析了(CoCrFeMnNi)97.02Mo2.98高熵合金析出σ相的演变规律，采用显微硬度及拉伸实验测试了其力学性能，研究了σ相对其力学性能的影响机制。结果表明，随着退火温度的升高，(CoCrFeMnNi)97.02Mo2.98高熵合金析出σ相量增多，且在晶界处先析出，后在晶内析出，晶界第二相形态由细小条状断续分布，逐渐变为粗大条状连续分布，随着温度进一步升高，由条状连续分布转变为颗粒状断续分布。(CoCrFeMnNi)97.02Mo2.98高熵合金退火处理析出σ相具有明显的第二相强化作用，随着退火温度的升高，硬度及强度均增大，当温度高于900 ℃尤为显著。σ相在晶内析出及其细化，能够促进合金强度与塑性同步提高。
关键词： CoCrFeMnNi高熵合金; Mo; 退火; σ相(CrMo相); 力学性能
姚小飞 , 魏敬鹏 , 吕煜坤 , 李田野 . (CoCrFeMnNi)97.02Mo2.98高熵合金σ相析出演变及力学性能[J]. 金属学报, 2020 , 56(5) : 769 -775 . DOI: 10.11900/0412.1961.2019.00330
Mo in the form of solid solution atom or compound phase is distributed in CoCrFeMnNi high entropy alloy, which has the effect of solution strengthening or second phase strengthening. The method of annealing was used to heat treated (CoCrFeMnNi)97.02Mo2.98 high entropy alloy to investigate effects of σ phase on mechanical properties of (CoCrFeMnNi)97.02Mo2.98 high entropy alloy. SEM, EDS and XRD were used to analyze effects of annealing temperature on precipitation σ phase (CrMo phase) in (CoCrFeMnNi)97.02Mo2.98 high entropy alloy. The mechanical properties were tested by microhardness and tensile test, and the influencing mechanism of σ phase on the mechanical properties was investigated. The results show that with increase of the annealing temperature, the quantity of precipitation σ phase increases in (CoCrFeMnNi)97.02Mo2.98 high entropy alloy, and the σ phase is first precipitated at the grain boundary, and is after precipitated in intracrystalline. The morphologies of σ phase at the grain boundary are changed gradually from tiny strips of discontinuous distribution to thick strip of continuous distribution. With the annealing temperature increases further, the morphologies of σ phase are changed from strip of continuous distribution to granular of continuous distribution. The precipitation σ phases in (CoCrFeMnNi)97.02Mo2.98 high entropy alloy by annealing have the effect of second phase reinforcement, with the annealing temperature increase, the numbers of precipitation σ phase increase, and the hardness and strength both increase, which is obviously at temperature higher than 900 ℃. The σ phase precipitation in intracrystalline, and its refinement, can improve the strength and plasticity of (CoCrFeMnNi)97.02Mo2.98 high entropy alloy synchronously.
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