Grain-size gradient NiTi ribbons with multiple-step shape transition prepared by melt-spinning
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第12期
论文作者：Xiangguang Kong Ying Yang Shiyu Guo Ran Li Bo Feng Daqiang Jiang Meng Li Changfeng Chen Lishan Cui Shijie Hao
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.
Xiangguang Kong1，Ying Yang1，Shiyu Guo1，Ran Li2，Bo Feng1，Daqiang Jiang1，Meng Li3，Changfeng Chen4，Lishan Cui1，Shijie Hao1,4
1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum2. Key Laboratory of Aerospace Materials and Performance, School of Materials Science and Engineering, Beihang University3. Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology4. Beijing Key Laboratory of Failure, Corrosion, and Protection of Oil/Gas Facilities, China University of Petroleum Beijing
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.
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