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

Journal Article · 31 October 2019 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI: https://doi.org/10.1016/j.msea.2019.138605 · OSTI ID:1580412

Paul, Partha P. ^[1]; Paranjape, Harshad M. ^[2]; Tamura, Nobumichi ^[3]; Chumlyakov, Yuri I. ^[4]; Brinson, L. Catherine ^[5]

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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); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: AC02-05CH11231; SC0010594
• OSTI ID: 1580412
• Journal Information: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 771; ISSN 0921-5093
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English