Microscopic self-accommodation in shape memory alloy martensites

Journal Article · Thu Apr 15 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90068-4· OSTI ID:6789099

Madangopal, K; Tiwari, R; Banerjee, S ^[1]

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1. Bhabha Atomic Research Centre, Bombay (India)

The significant property of shape memory alloys (SMA) is the ability to recover after deformation and upon unloading or heating, the predeformation microstructure or the microscopic shape. This property is essentially due to the self-accommodating nature of the SMA martensite. At a macroscopic level, self-accommodation involves clustering of martensite variants into groups (plate-plate interaction), whereby the total transformation strain is effectively minimized. The remaining unaccommodated stress in the surrounding matrix is further reduced by the interaction of different plate groups (group-group interaction). However, for the complete recovery of the macroscopic shape, all irreversible processes must be minimized; therefore, at the microscopic level, the interfaces which form between martensite variants in the plate-plate and group-group interactions should be coherent. The aim of this paper is to: (i) define the microscopic self-accommodation criterion and (ii) to determine the possible interfaces for all variant-variant interactions of SMA martensites.

• OSTI ID: 6789099
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 28:8; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
DEFORMATION
INTERFACES
MICROSTRUCTURE
MONOCRYSTALS
PHASE TRANSFORMATIONS
SHAPE MEMORY EFFECT
TWINNING