The role of coherent precipitates in martensitic transformations in single crystal and polycrystalline Ti-50.8at%Ni
- Univ. of Illinois, Urbana, IL (United States). Dept. of Mechanical and Industrial Engineering
- Siberian Physical and Technical Inst., Tomsk (Russian Federation). Physics of Plasticity and Strength of Materials Lab.
In the mid 80`s Miyazaki and colleagues discovered that there was a significant difference in the recoverable strain levels of solutionized versus aged NiTi single crystals. More recent research efforts have focused on understanding both thermal and stress-induced martensitic transformations in solutionized versus aged NiTi. Several researchers have determined that only a specific range of heat treatments (for example T {approximately} 673--773 K, t {approximately} 1--1.5 h for 50.8 at% Ni) are capable of precipitating coherent or semi-coherent particles in NiTi. Heat treatments that fall into the aforementioned range will be referred to as peak aging treatments since they lead to a drastic change in mechanical properties. The modeling of recoverable strain levels in peak aged samples has proven consistent with experimental observations. The purpose of the present study is to model the orientation dependence of the critical stress levels required to induce the transformation in peak aged specimens.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Russian Foundation for Basic Research (Russian Federation)
- DOE Contract Number:
- FG02-93ER14393
- OSTI ID:
- 653670
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 6; Other Information: PBD: 11 Aug 1998
- Country of Publication:
- United States
- Language:
- English
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