Mechanical Engineering Faculty Research

Title

Deformation Induced Martensite in NiTi and its Shape Memory Effects Generated by Low Temperature Laser Shock Peening

Document Type

Article

Publication Date

2012

Abstract

In this study, laser shock peening (LSP) was utilized to generate localized deformation induced martensite (DIM) in NiTi shape memory alloy. The DIM was investigated by x-ray diffraction and transmission electron microscopy. The effects of temperature and laser intensity on DIM transformation were investigated. It has been found that higher laser intensity and lower processing temperature leads to higher volume fraction of DIM. This is attributed to the increase of the chemical driving force and the increase in the density of potential martensite variant for martensite nucleation at low temperatures. The localized shape memory effect in micrometer scale after low temperature LSP has been evaluated.

Publication Title

Journal of Applied Physics

Volume

112

First Page

33515