Grain Structure Engineering of NiTi Shape Memory Alloys by Intensive Plastic Deformation.

ABSTRACT: To explore an effective route of customizing the superelasticity (SE) of NiTi shape memory alloys via modifying the grain structure, binary Ni₅₅Ti₄₅ (wt) alloys were fabricated in as-cast, hot swaged, and hot-rolled conditions, presenting contrasting grain sizes and grain boundary types. In situ synchrotron X-ray Laue microdiffraction and in situ synchrotron X-ray powder diffraction techniques were employed to unravel the underlying grain structure mechanisms that cause the diversity of SE performance among the three materials. The evolution of lattice rotation, strain field, and phase transformation has been revealed at the micro- and mesoscale, and the effect of grain structure on SE performance has been quantified. It was found that (i) the Ni_4</

SUBMITTER: Wang Z 

PROVIDER: S-EPMC9284517 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature