Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 41A, Issue 10, Pages 2595-2605Publisher
SPRINGER
DOI: 10.1007/s11661-010-0338-8
Keywords
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The hot deformation behavior of Ti-55Ni (at. pct) alloy was studied using compression testing at 1173 K (900 A degrees C) to 1323 K (1050 A degrees C) and at the strain rates of 0.001 to 0.35 s(-1). The microstructure evolution was characterized using optical and scanning electron microscopy (SEM). The influences of hot-working parameters on the flow stress and microstructural features of this alloy were then analyzed. The results indicate that, depending on the temperature and strain rate, the dynamic recrystallization (DRX) is the dominate mechanism. Besides, the particle-stimulated nucleation (PSN) mechanism could partially recrystallize the structure. The PSN phenomenon is of significant importance for the Ti-55Ni (at. pct) that suffers from insufficient workability because of its high content of intermetallic phases. It is of interest that the discontinuous yielding phenomenon has been observed when the specimens were deformed at 1173 K (900 A degrees C). Finally, the optimum parameters for hot working of Ti-55Ni (at. pct) alloy are determined as well.
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