Microstructure and mechanical property of additively manufactured NiTi alloys: A comparison between selective laser melting and directed energy deposition - Zheng, Dan; Li, Rui-di; Yuan, Tie-chui; Xiong, Yi; Song, Bo; Wang, Jia-xing; Su, Ya-dong (Journal of Central South University: Science & Technology of Mining and Metallurgy, 2021)