一种Ni-Mn-Ga-Co-Gd高熵合金的微观结构与磁场诱导应变

Microstructure and Magnetic Field-Induced Strain of a Ni-Mn-Ga-Co-Gd High-Entropy Alloy.

作者信息

Ju Jia, Hu Liang, Bao Chenwei, Shuai Liguo, Yan Chen, Wang Zhirong

机构信息

Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China.

Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, China.

出版信息

Materials (Basel). 2021 May 12;14(10):2514. doi: 10.3390/ma14102514.

DOI:10.3390/ma14102514

PMID:34066249

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8151419/

Abstract

The effect of a high-entropy design on martensitic transformation and magnetic field-induced strain has been investigated in the present study for Ni-Mn-Ga-Co-Gd ferromagnetic shape-memory alloys. The purpose was to increase the martensitic transition temperature, as well as the magnetic field-induced strain, of these materials. The results show that there is a co-existence of β, γ, and martensite phases in the microstructure of the alloy samples. Additionally, the martensitic transformation temperature shows a markedly increasing trend for these high-entropy samples, with the largest value being approximately 500 °C. The morphology of the martensite exhibits typical twin characteristics of type L1. Moreover, the magnetic field-induced strain shows an increasing trend, which is caused by the driving force of the twin martensite re-arrangement strengthening.

摘要

在本研究中，针对Ni-Mn-Ga-Co-Gd铁磁形状记忆合金，研究了高熵设计对马氏体相变和磁场诱导应变的影响。目的是提高这些材料的马氏体转变温度以及磁场诱导应变。结果表明，合金样品的微观结构中存在β、γ和马氏体相共存的情况。此外，这些高熵样品的马氏体转变温度呈现出明显的上升趋势，最大值约为500℃。马氏体的形态表现出典型的L1型孪晶特征。而且，磁场诱导应变呈上升趋势，这是由孪晶马氏体重新排列强化的驱动力引起的。