MICROSTRUCTURE AND PHASE TRANSFORMATION OF Ni43Co7Mn41Sn9 HIGH TEMPERATURE SHAPE MEMORY ALLOY RIBBON

CHEN Feng; SU Dexi; TONG Yunxiang; NIU Liqun; WANG Haibo; LI Li

doi:10.3724/SP.J.1037.2013.00155

Acta Metall Sin >

2013 , Vol. 49 >Issue 8: 976 - 980

DOI: https://doi.org/10.3724/SP.J.1037.2013.00155

MICROSTRUCTURE AND PHASE TRANSFORMATION OF Ni₄₃Co₇Mn₄₁Sn₉ HIGH TEMPERATURE SHAPE MEMORY ALLOY RIBBON

CHEN Feng ,
SU Dexi ,
TONG Yunxiang ,
NIU Liqun ,
WANG Haibo ,
LI Li

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1) Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001
2) College of Physics and Electronic Engineering, Taizhou University, Taizhou 318000

Received date: 2013-04-02

Revised date: 2013-05-17

Online published: 2013-08-11

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Abstract

NiCoMnSn shape memory alloy (SMA) is expected to be a promising high temperature SMA. However, the brittleness has become a big obstacle for its practical application. It is known that, grain refining is effective in improving the ductility of a specific metallic alloy. The aim of this work is to investigate the effect of melt--spinning on grain refinement and martensitic transformation and provide a guideline for the development of NiCoMnSn SMA. Ni₄₃Co₇Mn₄₁Sn₉ high temperature SMA ribbon was prepared by a single-roll melt-spinning method. The microstructure and martensitic transformation were investigated by means of OM, SEM, TEM, XRD and DSC, respectively. The experimental results showed that, the ribbon had a chemical composition close to the master alloy and exhibited a thermoelastic martensitic transformation at about 160℃. The grains in the as-spun ribbon, ranging from 2 μm to 18 μm,were remarkably refined compared with the master alloy. In the as--prepared ribbon,most of the columnar grains grew along the direction vertical to the ribbon plane.At room temperature, non-modulated martensite (tetragonal structure) consisting of twin substructure is determined in the ribbon after relieving the internal stress. Transformation temperatures were lowered by 30℃ after heat treatment at 400℃ for 1 h and then kept nearly constant with the increase of heat treatment temperatures.

Key words： Ni-Co-Mn-Sn; high temperature shape memory alloy; ribbon; rapid solidification; martensitic transformation

Cite this article

CHEN Feng , SU Dexi , TONG Yunxiang , NIU Liqun , WANG Haibo , LI Li . MICROSTRUCTURE AND PHASE TRANSFORMATION OF Ni₄₃Co₇Mn₄₁Sn₉ HIGH TEMPERATURE SHAPE MEMORY ALLOY RIBBON[J]. Acta Metall Sin, 2013 , 49(8) : 976 -980 . DOI: 10.3724/SP.J.1037.2013.00155

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