Ontology type: schema:ScholarlyArticle
2022-04-12
AUTHORSChao Li, Ming-Chuang Zhao, Hai-Long Jia, Cheng Wang, Pin-Kui Ma, Min Zha, Hui-Yuan Wang
ABSTRACTUnraveling the varied modification mechanisms of trace elements under diverse cooling rates is of great importance to regulate the morphology of primary Mg2Si in hypereutectic Al-Mg2Si alloys. In the present work, the modification mechanisms of Sr and Sb in Al-20Mg2Si alloys under different cooling rates are discussed in detail. Increasing the cooling rates from ~ 50 to 76 °C/s to ~ 213 to 230 °C/s leads to the morphology transition of primary Mg2Si from hoppers to dendrites, which is attributed to a smaller constitutional zone with the increase of temperature gradients introduced by high cooling rates. The addition of 0.15 wt pct Sr modifies the morphology of primary Mg2Si phase to cubes at cooling rates of ~ 50 to 76 °C/s and ~ 213 to 230 °C/s with the same modification mechanism, i.e., by increasing nucleation driving force for primary Mg2Si and the adsorption-poisoning effect. In contrast, the modification mechanisms of Sb are different under varying cooling rates. At low cooling rates of ~ 50 to 76 °C/s, Sb modifies the morphology of primary Mg2Si to be truncated octahedrons by introducing Mg3Sb2 particles as heterogeneous nuclei and the substitution of Sb to Si in Mg2Si crystals. At high cooling rates of ~ 213 to 230 °C/s, primary Mg2Si grows coarser with a dendrite morphology due to solute trapping, which changes the modification mechanism to substitution alone. Moreover, it is interesting that at cooling rates of ~ 213 to 230 °C/s, primary and eutectic Mg2Si particles in the Al-20Mg2Si-0.15Sr alloy are refined simultaneously, which greatly suppresses the crack formation and propagation. Accordingly, the ultimate tensile strength and elongation to failure are increased to ~ 242 MPa and ~ 5.6 pct compared to the unmodified alloy (~ 188 MPa and ~ 1.4 pct, respectively). More... »
PAGES1-11
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DOIhttp://dx.doi.org/10.1007/s11663-022-02506-5
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