The structure and mobility of the intervariant boundaries in 18R martensite in a Cu-Zn-Al alloy

Journal Article · Fri May 28 04:00:00 EDT 1999 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(99)00064-6· OSTI ID:357929

Zhang, J X ^[1]; Zheng, Y F; Zhao, L C ^[2]

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1. Chinese Academy of Sciences, Shenyang (China). Lab. of Atomic Imaging of Solids
2. Harbin Inst. of Tech. (China). School of Materials Science and Engineering

Detailed crystallographic analysis was carried out on the martensitic transformation and the various variant combinations in 18R martensite in a Cu-Zn-Al alloy. The self-accommodation of martensitic shear strain is quite perfect within a variant group, but not effective or even does not exist for variant combinations which belong to different groups. Twenty-three unique variant combinations between 24 martensite variants can be divided into four groups, i.e. reflection twin, 180 rotation twin, 120 rotation twin and 90 rotation twin. TEM and HREM observations show that the A C boundary is straight, well-defined and perfectly coherent, the A B boundary is irrational, coherent and gradually curved, and the A D boundary is stepped. The A C and A B boundaries have obvious mobility, and the mobility is not effective for A D boundary. The interplate group boundaries are curved, blurred and immobile. The morphology, structure and mobility of interplate boundary are all related to the degree of self-accommodation and the misorientation of twin boundary.

• OSTI ID: 357929
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 7 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COPPER ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALLOGRAPHY
INTERFACES
MARTENSITE
TRANSMISSION ELECTRON MICROSCOPY
ZINC ALLOYS