Stabilization of martensite in Cu-Zn-Si

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90247-P· OSTI ID:6402115

Dutkiewicz, J ^[1]; Chandrasekaran, M ^[2]; Cesari, E ^[3]

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1. Polish Academy of Science, Krakow (Poland)
2. Univ. of Twente, Enschede (Netherlands)
3. Univ. of Illes Balears, Palma de Mallorca (Spain)

In many copper based shape memory alloys, the retransformation of martensite to the parent occurs at a higher temperature, immediately after quenching through the transformation and/or aging in the martensitic condition when compared to retransformation in continued cycles performed without any delay. This effect termed stabilization, has been used to raise, temporarily, the retransformation temperature of the martensite in Cu-Zn-Si alloys, notably with compositions which transform to martensite well below ambient temperature. This has been achieved by heating the sample, with the martensite microstructure, very slowly, at a rate of about 0.25[degree]/min. There are few reports to date on the mechanism of stabilization of Cu-Zn-Si martensite. These reports cite all the reasons mentioned above as possible causes for the stabilization. Moreover, martensite boundary pinning by vacancies and narrow lamellae of 3R phase within the 9R martensite have been claimed as fairly important contributors to stabilization. The present work was undertaken to review these earlier conclusions and has been carried out in alloys that transform nominally at sub-zero temperatures. The studies are restricted to the first 10[degree] or 15[degree] of stabilization.

• OSTI ID: 6402115
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:1; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
COPPER ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DATA
DISLOCATION PINNING
EXPERIMENTAL DATA
INFORMATION
MICROSTRUCTURE
NUMERICAL DATA
PHASE TRANSFORMATIONS
POINT DEFECTS
QUENCHING
SHAPE MEMORY EFFECT
SILICON ALLOYS
STABILIZATION
VACANCIES
ZINC ALLOYS