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Title: In-situ, microscale characterization of heterogeneous deformation around notch in martensitic Shape Memory Alloy

Journal Article · · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
 [1];  [2];  [3];  [4];  [5]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Colorado School of Mines, Golden, CO (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Siberian Physical Technical Inst., Tomsk (Russia)
  5. Duke Univ., Durham, NC (United States)

Deformation characterization of low-symmetry phases such as martensite in SMAs is difficult due to a fine-scale hierarchical microstructure. With X-ray microLaue diffraction, in-situ deformation of martensite is examined in a notched NiTi specimen. The local deformation is influenced by the notch stress field, initial martensite microstructure, and interaction between notch stress field and the external load. The microstructure evolves heterogeneously and inelastically, with detwinning and twin nucleation occurring simultaneously through loading. These results contrast with the traditional view of martensite deformation that is partitioned in three distinct regimes: elasticity, reorientation and de-twinning.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; SC0010594
OSTI ID:
1580412
Alternate ID(s):
OSTI ID: 1693840
Journal Information:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 771, Issue C; ISSN 0921-5093
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science