Journal
MATERIALS & DESIGN
Volume 116, Issue -, Pages 300-308Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.12.021
Keywords
Martensitic transformation; Thermal cycle stability; Microstructure evolution; Mechanical property; High-temperature shape memory alloys (HTSMA)
Categories
Funding
- National Natural Science Foundation of China [51571168, 51471138, 51601161]
- Ministry of Science and Technology of China [2014DFA53040]
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [15H05766, 16H06632] Funding Source: KAKEN
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Co64V15Si21-xGax (x = 4, 6, 8, 10) alloys have been prepared to investigate the alloying effects of Ga on various properties of Co-V-Si high-temperature shape memory alloys, including crystal structure, transformation behavior, thermal cycle stability, microstructure evolution, mechanical property and shape memory behavior. Results show that the D0(22)-type martensite single-phase is transformed from the L2(1)-type parent phase in Co64V15Si17Ga4 alloys. With the increase of Ga content, R phase appears along grain boundaries of martensite and martensitic transformation temperatures decrease rapidly. Furthermore, the Co64V15Si17Ga4 alloy exhibits excellent thermal cycle stability and stable microstructure even after heated to high temperatures of similar to 800 degrees C repeatedly. On the other hand, for the (martensite + R) dual-phase alloys (Le., Co64V15Si15Ga6, Co64V15Si13Ga8 and Co64V15Si11Ga10), (epsilon Co) phase precipitates during thermal cycle process, with respective thermal cycle stabilities enhanced at different temperatures simultaneously. In addition, although excess Ga addition deteriorates the mechanical property significantly, it is still concluded that the doping of Ga has a positive effect on the development of shape memory effect of Co-V-Si high-temperature shape memory alloys. (C) 2016 Elsevier Ltd. All rights reserved.
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