Grain-size gradient NiTi ribbons with multiple-step shape transition prepared by melt-spinning  

作　　者：Xiangguang Kong Ying Yang Shiyu Guo Ran Li Bo Feng Daqiang Jiang Meng Li Changfeng Chen Lishan Cui Shijie Hao 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,China [2]Beijing Key Laboratory of Failure,Corrosion,and Protection of Oil/Gas Facilities,China University of Petroleum Beijing,Beijing,102249,China [3]Key Laboratory of Aerospace Materials and Performance,School of Materials Science and Engineering,Beihang University,Beijing,100191,China [4]Qian Xuesen Laboratory of Space Technology,China Academy of Space Technology,Youyi Street No.104,Haidian,Beijing,100094,China

出　　处：《Journal of Materials Science & Technology》2021年第12期163-168,共6页材料科学技术（英文版）

基　　金：supported by National Key R&D Program of China(2018YFB1105100);the NSFC(51971244,51731010,1637207);Science Foundation of China University of Petroleum,Beijing(2462018BJC005);the Pre-research Program of Frontier Science;Ministry of Education(6141A020222)。

摘　　要：A grain-size gradient Ni Ti ribbon with multiple-step shape transition was papered by means of meltspinning.The ribbons contain coarse and fine grains in the free surface side and copper roller surface side,respectively.The grain-size gradient microstructure induces a two-stage phase transformation behavior in the ribbons during heating or cooling.After tensile deformation pre-treatment,the ribbons exhibit a back-and-forth shape change(shape A→B→A)upon a single heating or cooling process,resulting from the sequential phase transformation through the thickness of the ribbon as dictated by gradient grain size.The activating performance of the ribbons,i.e.shape transition amplitude and speed,can be customized by controlling the pre-deformation strain.This work offers a new opportunity for innovative designs to reach a novel shape memory behavior in Ni Ti alloys conveniently and efficiently.

关 键 词：NiTi shape memory alloy Melt spinning Shape memory effect Martensitic transformation 

分 类 号：TG139.6[一般工业技术—材料科学与工程]