Indentation size effect and strain rate sensitivity of Ni3Ta high temperature shape memory alloy. (February 2019)

• Record Type: Journal Article
• Authors: Shuitcev, A.V.; Tong, Y.X.; Li, L.
• Is Part Of: Vacuum. Volume 160(2019)
• Page Start: 25
• Page End: 30
• Publication Date: 2019-02
• Subjects: Ni3Ta -- Shape memory alloys -- Rate sensitive -- Indentation size effect; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2018.11.017
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The present work focuses on mechanical properties of Ni3 Ta alloy. Reversible martensitic transformation is found in the temperature range of 520–600 K. At room temperature Ni3 Ta alloy mainly consists of a monoclinic phase. Ni3 Ta alloy exhibits a forward indentation size effect, the value of load independence hardness is equal to 5.3 GPa. The compressive behavior is dependent on strain rate, which is characterized by small activation volume (6.4 b 3 ), corresponding to the grain boundary sliding as the dominant deformation mechanism. Highlights: Ni3 Ta alloy exhibits martensitic transformation in range of 520–600 K. Load independence hardness of Ni3 Ta alloy is about 5.3 GPa. The activation volume of Ni3 Ta alloy is determined to be 6.4 b 3 .