Novel elastic deformation mechanism in multifunctional Ti–Nb alloy

Journal Article · Tue Oct 11 00:00:00 EDT 2016 · Materials Letters

DOI:https://doi.org/10.1016/j.matlet.2016.10.042· OSTI ID:1617668

Zhu, Zhaowei ^[1]; Wang, Yandong ^[1]; Hao, Yulin ^[2]; Liu, Jiapeng ^[3]; Zhang, Qinghua ^[3]; Li, Runguang ^[1]; Wang, Haoliang ^[2]; Ren, Yang ^[4]

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1. Univ. of Science and Technology, Beijing (China)
2. Chinese Academy of Science (CAS), Shenyang (China)
3. Beijing Inst. of Technology (China)
4. Argonne National Lab. (ANL), Argonne, IL (United States)

In-situ high-energy X-ray diffraction was used to reveal a novel elastic deformation mechanism of the polycrystalline Ti-24Nb-4Zr-8Sn alloy under uniaxial compression. These experiments of polycrystal provide direct evidence on anomalous change in full widths at half maximum for {110}_β peak during elastic deformation, i.e. peak broadening during unloading and peak narrowing upon loading, which is attributed to the formation of stress-induced irreversible ω phase as clearly demonstrated in single crystal during compression. Difference in modulus between omega and beta phases induces different change in lattice strain causing the broadening and narrowing of diffraction peak near {110}_β where actually contains $$\{\bar{1120}\}_{\omega}$$ under different applied stress. Finally, this study offers new perspectives to investigate intrinsic mechanism on specific phase transformation during elastic deformation.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities DivisionNational Natural Science Foundation of China (NSFC); National Basic Research Program of China; Chinese Academy of Sciences (CAS) State Key Laboratory for Advanced Metals and Materials; Fundamental Research Funds for the Central Universities
• Grant/Contract Number: AC02-06CH11357; 51471032; 51527801; 2012CB619405; 06111020
• OSTI ID: 1617668
• Journal Information: Materials Letters, Vol. 186, Issue C; ISSN 0167-577X
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
compression test
high-energy X-ray diffraction
elastic behavior
titanium alloys