Abstract
The 7075 aluminum alloy was an important structural material in the field of aeronautics and astronautics. With the development of this field, the requirements for its comprehensive properties were increasing. A novel casting method, the impact jet solid-liquid compound casting, was adopted to fabricate the 3A21/7075 aluminum alloy cladding material. Retrogression and reaging (RRA) treatment was further applied to the 3A21/7075 aluminum alloy cladding material in order to investigate the influence of RRA on microstructure and microhardness of the 3A21/7075 aluminum alloy cladding material. Then, the electron backscattered diffraction (EBSD) technique and the transmission electron microscope (TEM) together with the energy dispersive spectrometer (EDS) and the hardness test were utilized to analyze the influence of RRA treatment on microstructure and hardness of the 3A21/7075 aluminum alloy cladding material. The research results showed the 3A21/7075 aluminum alloy cladding material had better deformability. The amount of fine and dispersed phases precipitated in grains was in favor of improving the comprehensive mechanical properties of the 3A21/7075 aluminum alloy cladding material. This research might provide data and a theoretical approach for the engineering application of the 3A21/7075 aluminum alloy cladding material.
Highlights
High-strength aluminum alloy had been exploited as a mold material for prototype, production, and blow molding applications, due to the high thermal conductivity and the convenience of machinability [1]
There were a large number of equiaxed grains and several lengthened grains (LG) in the 3A21CCM casting zone
When metal and alloy were heated at high temperatures, they had a spontaneous tendency to move through grain boundary to reduce the total grain boundary area and reduced the total grain boundary energy
Summary
High-strength aluminum alloy had been exploited as a mold material for prototype, production, and blow molding applications, due to the high thermal conductivity and the convenience of machinability [1]. The processing technology of rolling aluminum alloy with wide and thick plates was still a bottleneck problem [4]. The HOKOTOL alloy produced by Corus Aluminum Wlzpodukte was a kind of high-strength aluminum alloy, mainly applied for thick plates of aluminum alloy, and its thickness can reach 700 mm. Mic-6 aluminum alloy belongs to precision casting aluminum heavy plate die alloy, and its typical thickness can reach 6~100 mm. The application of this product can replace the hot-rolled plate of ingot casting, and it can reduce the manufacturing cost of the die.
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