Β-grainsize Effects on the 18R-martensite Microstructure in Cu-based SMA. (2015)

• Record Type: Journal Article
• Authors: La Roca, P.; Isola, L.; Vermaut, Ph.; Malarría, J.
• Is Part Of: Procedia materials science. Volume 8(2015)
• Page Start: 1133
• Page End: 1139
• Publication Date: 2015
• Subjects: Materials science -- Congresses; Materials science -- Periodicals; Materials science; Conference proceedings; Periodicals; 620.11
• DOI: 10.1016/j.mspro.2015.04.177
• Languages: English
• ISSNs: 2211-8128

Abstract

Abstract: A systematic experimental analysis based on the assessment of the mean martensite plate size in sub-grain domains was implemented to characterize the martensitic microstructure morphology in polycrystalline Cu-based shape memory alloys. Experimental data was collected by light and electron microscopy, analysing polycrystalline materials of grain size ( d ) in a wide range: from fine-grained material with grain size of about 500 nm (ribbons and strips obtained by rapid solidification techniques) to single crystals of 6 mm diameter (grown by the Bridgman method). In the d range below 100 μm, a lineal relationship between the average width of the martensite plates ( h plate ) and the mean grain size was obtained for thermal-induced martensite transformation ( TMT ). Above this value ( d > 100 μm), such relation is no longer valid, and h plate becomes independent of grain size.