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Process optimization, microstructures and mechanical properties of a Cu-based shape memory alloy fabricated by selective laser melting.
- Source :
-
Journal of Alloys & Compounds . May2019, Vol. 785, p754-764. 11p. - Publication Year :
- 2019
-
Abstract
- Abstract The Cu-13.5Al-4Ni-0.5Ti copper-based shape memory alloys (SMAs) were fabricated by selective laser melting (SLM). The parameters were optimized to obtain almost fully dense copper-based SMAs samples. The phases and microstructures were characterized and the tensile properties at room temperature and 200 °C were evaluated. The XRD results showed that only the β 1 ′ phase could be detected in the Cu-based SMAs, which was attributed to the extremely short solidification time for the precipitation of α and γ 2 phases during SLM process. The grains were well refined and the average grain size was approximate 43 μm, which was much smaller than that of the cast copper-based SMAs. The X-phase (Cu 2 TiAl) is observed, which is granular and size 20–50 nm. The Cu-13.5Al-4Ni-0.5Ti copper-based SMAs fabricated by SLM exhibited excellent mechanical properties at room temperature, which was higher than that of the cast copper-based SMAs. This is attributed to two aspects: (1) grain refinement, (2) suppress of brittle γ 2 phase. Remarkably, the tensile test results at 200 °C showed both higher strength and elongation, which is attributed to the bcc structure of the parent phase and the stress-induced martensitic transformation at 200 °C. Meanwhile, the difference of microstructures and properties between SLM-fabricated Cu-based SMAs and casting Cu-based SMAs were analyzed and discussed in detail. Graphical abstract Image 1 Highlights • Near fully density Cu-13.5Al-4Ni-0.5Ti SMA is successfully fabricated. • β 1 ′ martensite and X phases are emerged in SLM-fabricated Cu-13.5Al-4Ni-0.5Ti. • The grain size of Cu-13.5Al-4Ni-0.5Ti alloy is smaller than cast counterparts. • The SLM-fabricated Cu-13.5Al-4Ni-0.5Ti SMA shows superior mechanical properties. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 785
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 135104565
- Full Text :
- https://doi.org/10.1016/j.jallcom.2019.01.153