A new mechanism for low and temperature-independent elastic modulus [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: Article numbers 11,477 (2,015) : digital, PDF file
Additional Creators:: Ohio State University, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

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.

Report Numbers:

E 1.99:1459343

Subject(s):

Materials Science

Note:

Published through SciTech Connect.
06/25/2015.
": BFsrep11477"
Scientific Reports 5 1 ISSN 2045-2322 AM
Liangxiang Zhang; Dong Wang; Xiaobing Ren; Yunzhi Wang.

Funding Information:

SC0001258

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