Journal
MATERIALS RESEARCH LETTERS
Volume 10, Issue 2, Pages 45-51Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2021.2013967
Keywords
Metastable titanium alloys; orthorhombic martensite-alpha ''; martensitic mechanical twinning
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Funding
- China Scholarship Council
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The complex hierarchical twinning-detwinning mechanism in α''-martensite and the associated rubber-like behavior have been clarified in TRIP/TWIP Ti-12Mo unprecedentedly via comprehensive in-situ investigations.
Beyond classic martensitic transformation-induced plasticity (TRIP), consecutive hierarchical twinning in the primary martensite is observed providing additional tensile strain about two-to-three times higher than the original transformation strain. The hierarchical twinning, operating in two different modes, contributes to at least one quarter of the plasticity in TRIP/TWIP Ti-12Mo alloy at early deformation stage. During tensile unloading, a peculiar multi-step detwinning process reverses the mechanically twinned martensite to its original orientation, resulting in rubber-like behavior. The complex reversible twinning process is investigated by combining in-situ EBSD/TEM experiments and theoretical rationalization with respect to Schmid factors and twin variant selection. [GRAPHICS] IMPACT STATEMENT The complex hierarchical twinning-detwinning mechanism in alpha ''-martensite and the associated rubber-like behavior have been clarified in TRIP/TWIP Ti-12Mo unprecedentedly via comprehensive in-situ investigations.
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