Microstructures, Martensitic Transformation, and Mechanical Behavior of Rapidly Solidified Ti-Ni-Hf and Ti-Ni-Si Shape Memory Alloys

Journal Article · Thu Mar 15 04:00:00 EDT 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3209-X· OSTI ID:22858030

Han, X. L.; Zhang, L. M.; Xing, H. ^[1]; Sarac, B. ^[2]; Spieckermann, F.; Maity, T.; Mühlbacher, M. ^[3]; Wang, L. ^[4]; Kaban, I. ^[5]; Eckert, J. ^[2]

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1. Northwestern Polytechnical University, Department of Applied Physics (China)
2. Austrian Academy of Sciences, Erich Schmid Institute of Materials Science (Austria)
3. Montanuniversität Leoben, Department Materials Physics (Austria)
4. Shandong University (Weihai), School of Mechanical, Electrical and Information Engineering (China)
5. IFW Dresden, Institute for Complex Materials (Germany)

In this work, the microstructure and mechanical properties of rapidly solidified Ti{sub 50−x/2}Ni{sub 50−x/2}Hf{sub x} (x = 0, 2, 4, 6, 8, 10, and 12 at.%) and Ti{sub 50−y/2}Ni{sub 50−y/2}Si{sub y} (y = 1, 2, 3, 5, 7, and 10 at.%) shape memory alloys (SMAs) were investigated. The sequence of the phase formation and transformations in dependence on the chemical composition is established. Rapidly solidified Ti-Ni-Hf or Ti-Ni-Si SMAs are found to show relatively high yield strength and large ductility for specific Hf or Si concentrations, which is due to the gradual disappearance of the phase transformation from austenite to twinned martensite and the predominance of the phase transformation from twinned martensite to detwinned martensite during deformation as well as to the refinement of dendrites and the precipitation of brittle intermetallic compounds.

• OSTI ID: 22858030
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 3 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
DEFORMATION
DENDRITES
DUCTILITY
HAFNIUM COMPOUNDS
INTERMETALLIC COMPOUNDS
MARTENSITE
MARTENSITIC STEELS
MICROSTRUCTURE
NICKEL COMPOUNDS
PRECIPITATION
SHAPE MEMORY EFFECT
SILICON COMPOUNDS
SOLIDIFICATION
TERNARY ALLOY SYSTEMS
TITANIUM COMPOUNDS
YIELD STRENGTH