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

Abstract

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.

Authors:
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
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1379351
Alternate Identifier(s):
OSTI ID: 1420584
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 21; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; interfaces; phase transformation; microstructure; Laue microdiffraction

Citation Formats

Chen, Xian, Tamura, Nobumichi, MacDowell, Alastair, and James, Richard D. In-situ characterization of highly reversible phase transformation by synchrotron X-ray Laue microdiffraction. United States: N. p., 2016. Web. doi:10.1063/1.4951001.
Chen, Xian, Tamura, Nobumichi, MacDowell, Alastair, & James, Richard D. In-situ characterization of highly reversible phase transformation by synchrotron X-ray Laue microdiffraction. United States. doi:10.1063/1.4951001.
Chen, Xian, Tamura, Nobumichi, MacDowell, Alastair, and James, Richard D. Mon . "In-situ characterization of highly reversible phase transformation by synchrotron X-ray Laue microdiffraction". United States. doi:10.1063/1.4951001. https://www.osti.gov/servlets/purl/1379351.
@article{osti_1379351,
title = {In-situ characterization of highly reversible phase transformation by synchrotron X-ray Laue microdiffraction},
author = {Chen, Xian and Tamura, Nobumichi and MacDowell, Alastair and James, Richard D.},
abstractNote = {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.},
doi = {10.1063/1.4951001},
journal = {Applied Physics Letters},
number = 21,
volume = 108,
place = {United States},
year = {2016},
month = {5}
}

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    Works referencing / citing this record:

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