A study of vacuum carburization of an equiatomic TiNi shape memory alloy
Journal
Scripta Materialia
Journal Volume
37
Journal Issue
6
Pages
837-842
Date Issued
1997
Author(s)
Abstract
The vacuum-carburized Ti50Ni50 alloy consists of a TiC layer in the outer surface, the thickness of which increases with increasing carburizing temperature and time. The carburized TiNi specimens, being hardened by the TiC phase, show improved wear characteristic. The martensitic transformation temperatures are depressed slightly to lower ones due to the constraint stress originating from the TiC layer, and the penetration of C atoms or other impurities into the TiNi matrix during the carburizing process. At the same time, the shape recovery of the carburized TiNi alloy is also slightly reduced because the TiC phase does not exhibit a shape memory effect and its constraint effect will also depress the shape recovery of the TiNi matrix.
Publisher
Elsevier Ltd
Type
journal article