TY - JOUR
T1 - Electron microscopy studies of the martensitic transformation in an aged Ti-51at%Ni shape memory alloy
AU - Nishida, M.
AU - Wayman, C. M.
AU - Chiba, A.
N1 - Funding Information:
This work was supported by the National Science Foundation through the Materials Research Laboratory at the University of Illinois, Grant No. NSF-DMR-83-16981-10. One of the authors (M.N.) gratefully acknowledges the Ishihara-Asada Research Fund (1986) of the Iron and Steel Institute of Japan. The alloys used were Idndly provided by Mr. K. Yamauchi of the Tohoku Metals Industry.
PY - 1988/8
Y1 - 1988/8
N2 - Microstructural aspects of the martensite phase in an aged Ti-51at%Ni alloy containing Ti3Ni4 precipitates have been studied systematically using optical and electron microscopy and electron diffraction. A morphological difference in the martensite phase formed in the solution treated and the aged specimens was confirmed. In the former, a dominance of variants forming a small triangular grouping was observed. Plate-like martensite variants formed along certain preferential directions were found in the latter. (001)M twins were observed as internal defects in the martensite formed in aged specimens. This phenomenon was more notable in specimens including finer precipitates. In these specimens, the internal defects in stress-induced martensite were also (001)M twins. Upon increasing the precipitate size by prolonged aging, the microstructure of the martensite in aged specimens recovers to that observed in solution-treated specimens. The mechanism for the formation of (001)M twins is discussed qualitatively in view of the interaction between the precipitates and the parent phase.
AB - Microstructural aspects of the martensite phase in an aged Ti-51at%Ni alloy containing Ti3Ni4 precipitates have been studied systematically using optical and electron microscopy and electron diffraction. A morphological difference in the martensite phase formed in the solution treated and the aged specimens was confirmed. In the former, a dominance of variants forming a small triangular grouping was observed. Plate-like martensite variants formed along certain preferential directions were found in the latter. (001)M twins were observed as internal defects in the martensite formed in aged specimens. This phenomenon was more notable in specimens including finer precipitates. In these specimens, the internal defects in stress-induced martensite were also (001)M twins. Upon increasing the precipitate size by prolonged aging, the microstructure of the martensite in aged specimens recovers to that observed in solution-treated specimens. The mechanism for the formation of (001)M twins is discussed qualitatively in view of the interaction between the precipitates and the parent phase.
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U2 - 10.1016/0026-0800(88)90025-0
DO - 10.1016/0026-0800(88)90025-0
M3 - Article
AN - SCOPUS:0024067245
SN - 1044-5803
VL - 21
SP - 275
EP - 291
JO - Materials Characterization
JF - Materials Characterization
IS - 3
ER -