Effects of Al Content on the Physical Properties of Al2O3 Dispersion-Strengthened Copper Alloys
Based on three kinds of CuAl alloy powders with Al mass fraction of 0.18, 0.55 and 1.95%, respectively, as raw materials and Cu2O powder as oxidant, three dispersion-strengthened copper alloy powders with Al2O3 content of 0.34, 1.00 and 3.19%, respectively, were prepared by internal oxidation using the optimal internal oxidation parameter. Hot pressing was subsequently adopted to prepare Al2O3 dispersion-strengthened copper (Cu–Al2O3) alloys. The effects of Al2O3 content on microstructures and properties of alloy powders and sintered alloys were studied. The results showed that the microhardness of three alloy powders after internal oxidation was significantly improved and increased with increasing Al2O3 content. But the difference between powders with 1.00 and 3.19% Al2O3 content was small. The relative densities of sintered alloys with lower Al2O3 content, i.e. 0.34 and 1.00%, were both above 99%. However that with higher Al2O3 content, i.e. 3.19%, was only 97.8%. With increasing Al2O3 content, electrical conductivity decreased and hardness increased obviously. The electrical conductivity and hardness (HRB) of three alloys were 86.0, 71.5, 60.0% IACS, and 68.8, 84.3, 91.0, respectively.
KeywordsAl2O3 dispersion-strengthened copper alloys Internal oxidation Hot pressing Electrical conductivity Hardness
This work was supported by Guangdong Provincial Industrial High-tech Project (No. 2015A010105020), Guangzhou Sci-tech Project (No. 201707010145), Zhongshan-Guangdong Academy of Sciences technology transfer special foundation (2016G1FC0007), Guangdong Academy of Sciences Implements Innovation-driven Development Capacity Building Project (No. 2017 GDASCX-0117), Guangdong Provincial Innovation Ability Construction Project (No. 2016B070701024) and Guangzhou Innovation Platform Construction and Sharing Project (No. 201509010003).
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