Martensitic transformation cycling in a [beta] Cu-Zn-Al alloy containing [gamma]-precipitates

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90124-B· OSTI ID:6270158

Pons, J; Cesari, E ^[1]

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1. Univ. de les Illes Balears, Palma de Mallorca (Spain). Dept. de Fisica

The evolution of the martensitic transformation during repetitive thermal cycling of Cu-Zn-Al single crystals containing different distributions of [gamma]-phase precipitates has been studied from the macro and microscopic points of view. Dense distributions of small coherent precipitates produce a highly reproducible transformation, with a practically null evolution of the hysteresis cycle; whereas a shift of the transformation to higher temperatures and a reduction of hysteresis width have been observed for distributions of bigger precipitates. The dislocations formed during cycling have the same characteristics than those formed in precipitate-free material, i.e. b = <100>, u = <111>. The dislocation arrays can be split into two groups: dislocations located around the precipitates and dislocations in the matrix between precipitates. These two types of arrays have opposing effects on the martensitic transformation. For dense distributions of small precipitates there is a compensation between the effects of both kinds of dislocations, leading to the observed lack of evolution during cycling. For bigger precipitates, the effect of the first kind of dislocations is clearly stronger.

• OSTI ID: 6270158
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:9; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DATA
DISLOCATIONS
DISTRIBUTION
EXPERIMENTAL DATA
INFORMATION
LINE DEFECTS
NUMERICAL DATA
PHASE TRANSFORMATIONS
PRECIPITATION
SEPARATION PROCESSES
SHAPE MEMORY EFFECT
SPATIAL DISTRIBUTION
TERNARY ALLOY SYSTEMS
THERMAL CYCLING
ZINC ALLOYS