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Title: In-situ characterization of highly reversible phase transformation by synchrotron X-ray Laue microdiffraction

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4951001· OSTI ID:1379351
ORCiD logo [1]; ORCiD logo [2];  [2];  [3]
  1. Univ. of Hong Kong (China). Dept. of Mechanical and Aerosace Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  3. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Aerospace Engineering and Mechanics
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The alloy Cu 25 Au 30 Zn 45 undergoes a huge first-order phase transformation (6% strain) and shows a high reversibility under thermal cycling and an unusual martensitc microstructure in sharp contrast to its nearby compositions. We discovered this alloy by systematically tuning the composition so that its lattice parameters satisfy the cofactor conditions (i.e., the kinematic conditions of compatibility between phases). It was conjectured that satisfaction of these conditions is responsible for the enhanced reversibility as well as the observed unusual fluid-like microstructure during transformation, but so far, there has been no direct evidence confirming that these observed microstructures are those predicted by the cofactor conditions. In order to verify this hypothesis, we use synchrotron X-ray Laue microdiffraction to measure the orientations and structural parameters of variants and phases near the austenite/martensite interface. The areas consisting of both austenite and multi-variants of martensite are scanned by microLaue diffraction. The cofactor conditions have been examined from the kinematic relation of lattice vectors across the interface. The continuity condition of the interface is precisely verified from the correspondent lattice vectors between two phases.

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
OSTI ID:
1379351
Alternate ID(s):
OSTI ID: 1420584
Journal Information:
Applied Physics Letters, Vol. 108, Issue 21; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (4)

Analysis of a Moving Mask Hypothesis for Martensitic Transformations journal April 2019
Probing Phase Transformations and Microstructural Evolutions at the Small Scales: Synchrotron X-ray Microdiffraction for Advanced Applications in 3D IC (Integrated Circuits) and Solar PV (Photovoltaic) Devices journal October 2016
Piecewise affine stress-free martensitic inclusions in planar nonlinear elasticity journal July 2017
A model for the evolution of highly reversible martensitic transformations journal March 2019

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Related Subjects

36 MATERIALS SCIENCE
interfaces
phase transformation
microstructure
Laue microdiffraction