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Outstanding shape memory effect and thermal stability of Cu–Al–Ni-based high temperature shape memory alloys achieved by Gd and Mn doping.
- Source :
-
Vacuum . Jul2024, Vol. 225, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- In this paper, the effects of Mn element and rare earth element Gd on the microstructure, thermal stability, mechanical properties and shape memory effect of polycrystalline Cu-12.0Al-4.0Ni and Cu-12.0Al-4.0Ni-1.5Mn- x Gd high-temperature shape memory alloy were investigated. The results show that the Cu-12.0Al-4.0Ni alloy exhibits millimeter-sized grain, dual-phase structure with coexistence of 18R and 2H martensite and poor thermal stability. When the Mn and Gd element was added to Cu-12.0Al-4.0Ni alloys, the grain size can be refined by an order of magnitude, and the 2H martensite disappeared completely, accompanied by the formation of the AlCu 4 Gd phase, meanwhile, thermal stability is significantly improved. The grain refinement improves the mechanical properties and shape memory effect of Cu-12.0Al-4.0Ni-1.5Mn- x Gd alloys. When x = 0.3, the compressive fracture stress, compressive fracture strain and recoverable strain can reach 969 MPa, 15 % and 8 %, respectively. • Cu–Al–Ni-based shape memory alloy achieved exceptional thermal stability. • Fully recoverable strain of the alloy reached 8 %. • The stress shielding effect is responsible for the ductility deterioration. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0042207X
- Volume :
- 225
- Database :
- Academic Search Index
- Journal :
- Vacuum
- Publication Type :
- Academic Journal
- Accession number :
- 177372591
- Full Text :
- https://doi.org/10.1016/j.vacuum.2024.113253