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Title: A new mechanism for low and temperature-independent elastic modulus

Abstract

The first Elinvar alloy, FeNiCr, which has invariant elastic modulus over a wide temperature range, was discovered almost 100 years ago by Guillaume. The physical origin of such an anomaly has been attributed to the magnetic phase transition taking place in the system. However, the recent discovery of non-magnetic Elinvar such as multi-functional β-type Ti alloys has imposed a new challenge to the existing theories. In this study we show that random field from stress-carrying defects could suppress the sharp first-order martensitic transformation into a continuous strain glass transition, leading to continued formation and confined growth of nano-domains of martensite in a broad temperature range. Accompanying such a unique transition, there is a gradual softening of the elastic modulus over a wide temperature range, which compensates the normal modulus hardening due to anharmonic atomic vibration, resulting in a low and temperature-independent elastic modulus. As a result, the abundance of austenite/martensite interfaces are found responsible for the low elastic modulus.

Authors:
 [1];  [1];  [2];  [3]
  1. Xi'an Jiaotong Univ., Xi'an (China)
  2. Xi'an Jiaotong Univ., Xi'an (China); National Institute for Materials Science, Ibaraki (Japan)
  3. Xi'an Jiaotong Univ., Xi'an (China); The Ohio State Univ., Columbus, OH (United States)
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1459343
Grant/Contract Number:  
SC0001258
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, Liangxiang, Wang, Dong, Ren, Xiaobing, and Wang, Yunzhi. A new mechanism for low and temperature-independent elastic modulus. United States: N. p., 2015. Web. doi:10.1038/srep11477.
Zhang, Liangxiang, Wang, Dong, Ren, Xiaobing, & Wang, Yunzhi. A new mechanism for low and temperature-independent elastic modulus. United States. doi:10.1038/srep11477.
Zhang, Liangxiang, Wang, Dong, Ren, Xiaobing, and Wang, Yunzhi. Thu . "A new mechanism for low and temperature-independent elastic modulus". United States. doi:10.1038/srep11477. https://www.osti.gov/servlets/purl/1459343.
@article{osti_1459343,
title = {A new mechanism for low and temperature-independent elastic modulus},
author = {Zhang, Liangxiang and Wang, Dong and Ren, Xiaobing and Wang, Yunzhi},
abstractNote = {The first Elinvar alloy, FeNiCr, which has invariant elastic modulus over a wide temperature range, was discovered almost 100 years ago by Guillaume. The physical origin of such an anomaly has been attributed to the magnetic phase transition taking place in the system. However, the recent discovery of non-magnetic Elinvar such as multi-functional β-type Ti alloys has imposed a new challenge to the existing theories. In this study we show that random field from stress-carrying defects could suppress the sharp first-order martensitic transformation into a continuous strain glass transition, leading to continued formation and confined growth of nano-domains of martensite in a broad temperature range. Accompanying such a unique transition, there is a gradual softening of the elastic modulus over a wide temperature range, which compensates the normal modulus hardening due to anharmonic atomic vibration, resulting in a low and temperature-independent elastic modulus. As a result, the abundance of austenite/martensite interfaces are found responsible for the low elastic modulus.},
doi = {10.1038/srep11477},
journal = {Scientific Reports},
issn = {2045-2322},
number = 1,
volume = 5,
place = {United States},
year = {2015},
month = {6}
}

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Free Publicly Available Full Text
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Cited by: 11 works
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