Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 25, Issue 3, Pages 699-712Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(15)63655-X
Keywords
6061 aluminum alloy; semisolid powder thixoforging; mechanical properties; tensile properties; hardness; microstructure
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Funding
- Basic Scientific Fund of Gansu University, China [2014-07]
- Program for New Century Excellent Talents in University of China [NCET-10-0023]
- Program for Hongliu Outstanding Talents of Lanzhou University of Technology, China
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A new processing technology, powder thixoforming, for preparation of particle reinforced metal matrix composites was proposed and 6061 aluminum alloy was prepared by powder thixoforging. 6061 ingots were first prepared by cold-pressing the atomized 6061 alloy powders, and then the ingots were partially remelted followed by thixoforging. The effects of reheating time, mould temperature and reheating temperature on microstructure and mechanical properties of the thixoforged alloys were investigated. The results indicate that all of the three parameters have large effects on the microstructure and mechanical properties. Owing to the microstructure changes, the fracture regime varies with the processing parameters. Furthermore, cracks always initiate from shrinkage porosities and inclusions, and then propagate either along the secondarily solidified structures or primary particles. The ultimate tensile strength, elongation and hardness of the resulting alloy are up to 196 MPa, 11.0% and HV 55.7 respectively.
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