Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/58392
Title: Influence of heat treatment on properties of copper-based shape-memory alloy
Authors: Lai, M.O. 
Lu, L. 
Lee, W.H.
Issue Date: 1996
Source: Lai, M.O.,Lu, L.,Lee, W.H. (1996). Influence of heat treatment on properties of copper-based shape-memory alloy. Journal of Materials Science 31 (6) : 1537-1543. ScholarBank@NUS Repository.
Abstract: An investigation was performed on a Cu-Zn-Al ternary alloy to examine the influence of heat treatment on its shape-memory effect. Four heat treatments were carried out, namely, step quenching, ice-water quenching, water quenching and glycol quenching from three different temperatures of 800, 850 and 900°C. It was observed that step-quenched samples showed the best martensitic structure for high resistance to shape-memory degradation. Ice-water quenching induced vacancy-pinning effects and hence lowered transformation temperature and degradation life compared to step quenching. However, no transformation was detected in water and glycol-quenched specimens due to the stabilization of martensite. The results showed that shape-memory effect is strongly influenced by many heat-treatment parameters, such as betatizing temperature, betatizing duration and rate of quenching. Step-quenched specimens also showed a higher number of cycles to failure in comparison to ice-quenched specimens. Owing to the dominating effects of large grain size and martensitic plates, the advantages of step quenching, however, disappeared when a high betatizing temperature of 900°C was used. Several kinds of defects were observed after fatigue testing, namely microvoids, cracks near martensitic plates, cracks at the interface of inclusions and inside inclusions. © 1996 Chapman & Hall.
Source Title: Journal of Materials Science
URI: http://scholarbank.nus.edu.sg/handle/10635/58392
ISSN: 00222461
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

38
checked on Dec 8, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.