Microstructure Evolution of an Extruded High Silicon Semi-solid State Aluminum Alloys During Reheating
CHEN Zhiguo1,2, FANG Liang2, WU Jiwen1, ZHANG Haichou1, MA Wenjing2, BAI Yuelong3,4
1 School of Energy and Electromechanical Engineering, Hunan University of Humanities Science and Technology, Loudi 417000 2 School of Materials Science and Engineering, Central South University, Changsha 410083 3 General Research Institute for Nonferrous Metals, Beijing 100088 4 Hunan Wenchang Technology Company Limited, Loudi 417000
Abstract: The present work aimed to investigate the rule of reheating an extruded high silicon aluminum alloy into semi-solid state, so as to obtain a near globular microstructure. The results showed that reheating power and reheating temperature are two key parameters which affect considerably the reheating process. The increase of heating power can magnify the difference of microstructure for core and edge parts of billets. And with the increase of reheating temperature, the fine and irregular grains grow gradually and spheroidizes. The optimum reheating process parameters suitable for thixoforming were determined to be 7 kW (power) and 530 ℃ (temperature), by analyzing the microstructure for different process. Under this processing condition, the average grain diameter of the resultant specimen experienced reheating was 35.2 μm and the ultimate strength was 418.5 MPa.
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2019, Vol. 33 
