期刊
PHYSICS OF METALS AND METALLOGRAPHY
卷 119, 期 2, 页码 134-145出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0031918X17120079
关键词
shape-memory alloys; titanium nickelide; microstructure; phase transformations; differential scanning calorimetry; functional properties
资金
- Ministry of Education and Science of the Russian Federation [11.1495.2017/PCh]
- Program for an Increase in the Competitive Ability of the National University of Science and Technology (MISiS) [K4-2014-018]
- National Council for Scientific and Technical Research of Canada (NSERC)
Differential scanning calorimetry has been used to study the effect of the temperature and holding time upon isothermal annealing on the calorimetric effects of the martensitic transformations (MTs) of an aging Ti-50.7 at % Ni alloy produced by hot helical rolling at a temperature of 850-900A degrees D with subsequent cooling in air. The sequence of the phase transitions upon reverse MT has been determined using X-ray diffractometry. The regularities of the evolution of the characteristic temperatures of martensitic transformations after annealing at temperatures of 400, 430, and 450A degrees D for 1-10 h have been analyzed. The results of electron-microscopic studies of the structure of the alloy in the initial state and after annealing have been presented; the features of the morphology of the Ti3Ni4 phase precipitated upon aging have been analyzed. Based on the results of calorimetric and structural studies, the temperature of the highest intensity of the aging processes has been determined.
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