Microstructural aspects of precipitation and martensitic transformation in a Ti-rich Ni-Ti alloy

Journal Article · Thu Feb 15 04:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00570-6· OSTI ID:194943

Lopez, H F ^[1]; Salinas-Rodriguez, A; Rodriguez-Galicia, J L ^[2]

---

1. Univ. of Wisconsin, Milwaukee, WI (United States). Materials Dept.
2. Unidad Saltillo (Mexico). Centro de Investigacion y Estudios Avanzados

Near-equiatomic NiTi alloys are among the most important shape memory alloys (SMA) due to their outstanding mechanical properties, corrosion resistance, and biocompatibility. In these alloys, thermal mechanical processing or additions of other elements are often used to modify the martensite-austenite (M-A) transformation temperatures, as well as the alloy strength. Nevertheless, in near-equiatomic Ni-Ti alloys, small deviations from stoichiometry can give rise to significant precipitation of second phases. This in turn affects both the alloy strength and the shape memory effect. Thus, it is the aim of the present work to investigate the metallurgical aspects associated with the precipitation reactions exhibited in a Ti-rich Ni-Ti alloy, as well as the role of thermal aging on the exhibited transformation temperatures.

• OSTI ID: 194943
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 4 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
AUSTENITE
MARTENSITE
MICROSTRUCTURE
NICKEL ALLOYS
OXIDATION
PHASE TRANSFORMATIONS
PRECIPITATION
SHAPE MEMORY EFFECT
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS