硅对FeCrNi中熵合金微观结构和力学性能的影响

Effect of Si on Microstructure and Mechanical Properties of FeCrNi Medium Entropy Alloys.

作者信息

Ding Fang, Cao Yuankui, Fu Ao, Wang Jian, Zhang Weidong, Qiu Jingwen, Liu Bin

机构信息

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.

College of Materials Science and Engineering, Hunan University, Changsha 410082, China.

出版信息

Materials (Basel). 2023 Mar 28;16(7):2697. doi: 10.3390/ma16072697.

DOI:10.3390/ma16072697

PMID:37048991

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10095722/

Abstract

FeCrNi medium entropy alloy (MEA) has been widely regarded for its excellent mechanical properties and corrosion resistance. However, insufficient strength limits its industrial application. Intermetallic particle dispersion strengthening is considered to be an effective method to improve strength, which is expected to solve this problem. In this work, microstructural evolution and mechanical behavior of FeCrNi MEA with different Si content were investigated. We found that the precipitation of fine σ particles can be formed in situ by thermomechanical treatment of Si doping FeCrNi MEAs. The FeCrNiSi MEA exhibits a good combination of strength and ductility, with yield strength and tensile elongation of 1050 MPa and 7.84%, respectively. The yield strength is almost five times that of the as-cast FeCrNi MEA. The strength enhancement is mainly attributed to the grain-boundary strengthening and precipitation strengthening caused by fine σ particles.

摘要

FeCrNi中熵合金（MEA）因其优异的力学性能和耐腐蚀性而受到广泛关注。然而，强度不足限制了其工业应用。金属间化合物颗粒弥散强化被认为是提高强度的有效方法，有望解决这一问题。在这项工作中，研究了不同Si含量的FeCrNi MEA的微观结构演变和力学行为。我们发现，通过对含Si的FeCrNi MEA进行热机械处理，可以原位形成细小的σ相颗粒沉淀。FeCrNiSi MEA表现出良好的强度和延展性组合，屈服强度和拉伸伸长率分别为1050 MPa和7.84%。屈服强度几乎是铸态FeCrNi MEA的五倍。强度提高主要归因于细小σ相颗粒引起的晶界强化和沉淀强化。