Microstructure and mechanical properties of rapidly solidified Al-Cr alloys |
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Authors: | Guofa Mi Yalin Mo Kuangfei Wang |
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Affiliation: | (1) School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China |
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Abstract: | The microstructure and mechanical properties of rapidly solidified Al-Cr alloys were investigated by XRD, TEM and microhardness
testing instrument. The results indicate that the matrix of rapidly solidified Al-Cr alloys is α-Al solid solution when the Cr content is lower than 4 wt%. However, when the Cr content is above 4 wt%, the microstructures
of rapidly solidified Al-Cr alloys are different along cross section. The microstructure of alloy contacting copper roller
consists of α-Al and a few intermetallic compounds. With the increase of distance from copper roller, the matrix consists of α-Al and spherical intermetallic compounds which conglomerate in α-Al matrix. These intermetallic compounds are Al7Cr, Al11Cr and Al4Cr. The tensile strength has the maximal value when the Cr content is about 8 wt%. The annealed microstructures show that
supersaturated α-Al solid solution dissolved with increasing anneal temperature. The starting temperature of the second phase precipitated
from the supersaturated α-Al solid solution desponds on the supersaturation. Meanwhile, the microhardness of rapidly solidified Al-Cr alloy reaches
maximal value after annealing at 300 °C.
Funded by the Innovation Fund for Outstanding Scholar of Henan Province (No. 0621000700) |
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Keywords: | rapid solidification Al-Cr alloy microstructure mechanical properties |
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