Wang Man, Jiang Shuyong, Zhang Yanqiu
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China.
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
Materials (Basel). 2018 Nov 21;11(11):2334. doi: 10.3390/ma11112334.
Martensitic transformation, reverse martensitic transformation, twinning, and detwinning of equiatomic nickel⁻titanium shape-memory alloy (NiTi SMA) under the action of a shock wave are studied using a molecular-dynamics simulation. In the loading process of a shock wave, B2 austenite is transformed into B19' martensite, whereas in the unloading process of the shock wave, B19' martensite is transformed into B2 austenite. With repeated loading and unloading of the shock wave, martensitic transformation occurs along with twinning, but reverse martensitic transformation appears along with detwinning. The mechanisms for the twinning and detwinning of NiTi SMA subjected to a shock wave are revealed in order to lay the theoretical foundation to investigate the shape-memory effect and superelasticity.
采用分子动力学模拟研究了等原子比镍钛形状记忆合金（NiTi SMA）在冲击波作用下的马氏体相变、逆马氏体相变、孪生和去孪生过程。在冲击波加载过程中，B2奥氏体转变为B19'马氏体，而在冲击波卸载过程中，B19'马氏体转变为B2奥氏体。随着冲击波的反复加载和卸载，马氏体相变伴随着孪生发生，而逆马氏体相变则伴随着去孪生出现。揭示了NiTi SMA在冲击波作用下的孪生和去孪生机制，为研究形状记忆效应和超弹性奠定了理论基础。
