Structure and Martensitic Transformation in Rapidly Solidified CoNiAlFe Alloy

Metals

Huan Liu¹  Zhuang Liu²  Huiling Chen³  Jia Ju³  Liguo Shuai³  Chen Yan⁴ 

[1] College of Mechanics and Materials, Hohai University, Nanjing 211100, China;Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, School of Materials Engineering, Nanjing Institute of Technology, Nanjing 211167, China;School of Mechanical Engineering, Southeast University, Nanjing 211189, China;Zhongtian Alloy Technology Co., Ltd., Nantong 226010, China;

关键词: structure;    twin martensite;    phase transformation;    housler alloy;    CoNiAlFe;   

DOI  :  10.3390/met7110473

来源: DOAJ

【 摘 要 】

Housler based magnetic controlled shape memory alloys are characterized by a large magnetic field induced strain. The strain was dependent on the twin martensite structure rearrangement, and the rapid solidification technology had a significant influence on the microstructure, physical, and chemical properties of the alloy. Thus, the structure and the martensitic transformation changes of Co33Ni31Al27Fe9 during the rapidly solidified process were studied. The microstructure of Co33Ni31Al27Fe9 with furnace cooled and rapid solidification (RS) constitutes a dual-phase structure, β phase and γ phase in a low cooling rate and martensite and γ phase in a high cooling rate. The γ phase at the grain boundaries reduced and became more fragile by raising the RC value. The one-step austenite-martensite phase transformation occurred during the process of heating and cooling. The phase transition temperature presents an increasing trend by rising the cooling rate, even to over the room temperature. Moreover, the martensite structure in Co33Ni31Al27Fe9 constitutes a typical L10-type twinning structure.

【 授权许可】

Unknown