Investigations on the electronic, structural, magnetic properties related to shape-memory behavior in Ti{sub 2}CoX (X=Al, Ga, In)

Journal Article · Sun Feb 15 00:00:00 EST 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.11.036· OSTI ID:22420816

Wei, Xiao-Ping ^[1]; Chu, Yan-Dong; Sun, Xiao-Wei; E, Yan ^[1]; Deng, Jian-Bo ^[2]; Xing, Yong-Zhong ^[3]

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1. The School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070 (China)
2. Department of Physics, LanZhou University, Lanzhou 730000 (China)
3. Department of Physics, Tianshui Normal University, Tianshui 741000 (China)

Highlights: • The analysis of phase stability trend is studied for Ti{sub 2}CoX(X = Al, Ga, In). • Ti{sub 2}CoGa is more suitable as shape memory alloy. • Total magnetic moments disappear with a increase of c/a ratio for all systems. • Density of states at the Fermi level are also shown. - Abstract: Using the full-potential local orbital minimum-basis method, we have performed a systematic investigations on the electronic, structural, and magnetic properties related to shape memory applications for Ti{sub 2}CoX (X=Al, Ga, In) alloys. Our results confirm that these alloys are half-metallic ferromagnets with total magnetic moment of 2μ{sub B} per formula unit in austenite phase, and undergo a martensitic transformation at low temperatures. The relative stabilities of the martensitic phases differ considerably between Ti{sub 2}CoX (X=Al, Ga, In). Details of the electronic structures suggest that the differences in hybridizations between the magnetic components are responsible for trends of phase. Quantitative estimates for the energetics and the magnetizations indicate that Ti{sub 2}CoGa is a promising candidate for shape memory applications.

• OSTI ID: 22420816
• Journal Information: Materials Research Bulletin, Vol. 62; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
AUSTENITE
COBALT ALLOYS
DENSITY OF STATES
ELECTRONIC STRUCTURE
FERMI LEVEL
GALLIUM ALLOYS
INDIUM ALLOYS
INTERMETALLIC COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIZATION
MARTENSITIC STEELS
PHASE STABILITY
PHASE TRANSFORMATIONS
SHAPE MEMORY EFFECT
TITANIUM ALLOYS