High strength and good ductility of casting Al-Cu alloy modified by PrxOy and LaxOy |
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Authors: | Hailong ZhaoDongming Yao Feng QiuYumei Xia Qichuan Jiang |
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Affiliation: | Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun, Jilin Province 130025, PR China |
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Abstract: | A modified Al-Cu alloy with high tensile strength and ductility of about 574.0 MPa and 10.4%, respectively, was obtained by adding multiple rare earth oxides (PrxOy and LaxOy) as modifier. Compared with the unmodified Al-Cu alloy, the tensile strength and ductility of the modified sample were increased by 24.3% and 42.5%, respectively. The improvement both in the strength and ductility may attribute to the finer crystal grains and dendrites, more homogeneously distributed θ′ phase precipitates and the intermetallic compounds formed at the crystal grain boundaries as well as in the space of the dendrites. |
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Keywords: | Al-Cu alloy Mechanical properties Modifier Rare earth oxides |
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