Abstract
The stress-induced phase transformation and micromechanical behavior of CuZr-based alloy were investigated by in-situ neutron diffraction. The pseudoelastic behavior with a pronounced strain-hardening effect is observed. The retained martensite nuclei and the residual stress obtained from the 1st cycle reduce the stress threshold for the martensitic transformation. A critical stress level is required for the reverse martensitic transformation from martensite to B2 phase. An increase of intensity for the B2 (110) plane in the 1st cycle is caused by the twinning along the {112}<111> twinning system. The convoluted stress partitioning influenced by the elastic and transformation anisotropy along with the newly formed martensite determines the microstress partitioning of the studied CuZr-based alloy. The reversible martensitic transformation is responsible for the pseudoelasticity. The macro mechanical behavior of the pure B2 phase can be divided into 3 stages, which are mediated by the evolvement of the martensitic transformation. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
| Original language | English |
|---|---|
| Pages (from-to) | 1096-1104 |
| Number of pages | 9 |
| Journal | Journal of Alloys and Compounds |
| Volume | 696 |
| DOIs | |
| State | Published - 2017 |
Funding
In situ neutron diffraction experiments were carried out at SNS, ORNL, supported by the U.S. Department of Energy, Basic Energy Sciences, Scientific User Facilities Division. Dongmei Wang is grateful for the financial support provided by the China Scholarship Council (CSC) during the visit to the Oak Ridge National Laboratory (ORNL) and the University of Tennessee. Y.D. Wang, J. Mu and D.M. Wang acknowledge the financial support from the National Natural Science Foundation of China (NSFC) (Grant No.s 51231002, 51471032 and 51527801 and 51301034). The authors thank Mr. M. Frost, Mr. H. Skorpenske from ORNL and Dr. Z.W. Zhu, Dr. Z.K. Li, Dr. P.F. Sha, Mr. Y. Liu, Mr. W.Q. Liu, Mr. D.M. Liu and Mr. D.C. Yu from Shenyang Chinese Academy of Sciences for their technical assistance in this research.
| Funders | Funder number |
|---|---|
| Shenyang Chinese Academy of Sciences | |
| U.S. Department of Energy | |
| Basic Energy Sciences | |
| Oak Ridge National Laboratory | |
| University of Tennessee | |
| National Natural Science Foundation of China | 51527801, 51471032, No.s 51231002, 51301034 |
| China Scholarship Council |
Keywords
- In-situ neutron diffraction technique
- Macro mechanical behavior
- Micromechanical behavior
- Stress partitioning
- Stress-induced martensitic transformation