Stress-induced strain glass to martensite (R) transition in a Ti 50 Ni 44.5 Fe 5.5 alloy

摘要: Strain glass (STG) in Ni-rich binary Ti-Ni possesses an R-like (rhombohedral) local strain order, but it transforms into B19’ martensite under stress. It remains a puzzle why the order STG yields different long-range order. Here, we systematically investigated ternary Ti50Ni44.5Fe5.5 STG, which exhibited same features as and is also anR-like one. Different from stress this normal R phase rather than B19’. By considering that both systems have bi-instability with respect to martensites schematic free-energy landscape, provide unified explanation for products of stress-induced (STG-M) transition between system present system. We show differences stem competing thermodynamic stability R-phase martensites.