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Significant improvement of semi-solid microstructure and mechanical properties of A356 alloy by ARB process

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
528
Issue
6
Identifiers
DOI: 10.1016/j.msea.2010.11.086
Keywords
  • Aluminum Alloy (A356)
  • Semi-Solid
  • Accumulative Roll Bonding
  • Microstructure
  • Mechanical Properties

Abstract

Abstract Accumulative roll bonding (ARB) process was used in this study as an effective method for manufacturing high-strength, finely-dispersed and highly-uniform A356 alloy. It was found that when the number of ARB cycles was increased, the uniformity of silicon particles in the aluminum matrix improved, the particles became finer and spheroider and therefore, the tensile strength (TS) and ductility of the samples improved. The microstructure of the manufactured A356 alloy after five ARB cycles indicated a totally modified structure such that it's TS and elongation values reached 269MPa and 5.3% which were 2.6 and 2.5 times greater than those of the as-cast material, respectively. Also, the hardness value increased from 55.4 (for as-cast sample) to 100.2HV (after the fifth cycle of ARB), and registered 81% increase.

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