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Journal of Materials Engineering and Performance
Erschienen in: Journal of Materials Engineering and Performance 11/2018

08.10.2018

Microstructure and Mechanical Properties of Cast Al-5Zn-2Mg Alloy Subjected to Equal-Channel Angular Pressing

verfasst von: G. K. Manjunath, G. V. Preetham Kumar, K. Udaya Bhat, Prashant Huilgol

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 11/2018

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Abstract

In the present work, cast Al-5Zn-2Mg alloy was processed through equal-channel angular pressing (ECAP) in route BC up to four number of passes. Microstructure and mechanical properties were investigated on processed and unprocessed materials. In cast condition, the material was composed of dendritic structure. After homogenization treatment, large-sized grains were observed. After ECAP processing, significant grain refinement was observed. After ECAP processing, high-density dislocations and high degree of misorientation between the grains were observed. In cast material, rod-shaped precipitates were observed, while, after ECAP processing, spherical-shaped precipitates were observed. ECAP processing leads to a noticeable improvement in the mechanical properties of the material. After four passes, 122% improvement in the microhardness and 135% improvement in the ultimate tensile strength of the material were observed. After three passes, a slight decrease in the mechanical properties was observed. This is attributed to the dissolution of the metastable η′ phase, annihilation of dislocations, dynamic recrystallization and texturing during ECAP processing. Brittle fracture mode was observed in tensile testing cast and homogenized samples. After ECAP processing, fracture mode was changed into shear fracture mode.
Vorheriger Artikel Influence of Rotation Rate on Microstructure and Comprehensive Performance of FSWed Mg Alloy
Nächster Artikel Thermal Analysis of Cerium-Treated Chill-Cast Al-23 Si Alloy

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Metadaten
Titel
Microstructure and Mechanical Properties of Cast Al-5Zn-2Mg Alloy Subjected to Equal-Channel Angular Pressing
verfasst von
G. K. Manjunath
G. V. Preetham Kumar
K. Udaya Bhat
Prashant Huilgol
Publikationsdatum
08.10.2018
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 11/2018
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3691-1

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