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从流变学和耐蚀性两方面对半固态Mg-Al-Zn合金进行了设计和分析。结果显示,当Al含量在6%~11%之间,固相率为30%~60%时,随着Al含量增加,固相率随温度变化的敏感性降低,凝固温度区间变窄。从耐蚀性方面分析,在固相率相同时,固相粒子数量越多、直径越小,初始腐蚀速率越快,腐蚀的总量越少。当Al含量超过8%时形成连续的β相,抑制半固态镁合金的腐蚀。因此,当Al含量在8%~11%之间时,既能满足半固态成形要求,又能改善半固态镁合金的耐蚀性能。
The semi-solid Mg-Al-Zn alloys were designed and analyzed from the aspects of rheology and corrosion resistance. The results show that with the Al content increasing from 6% to 11% and the solid fraction ranging from 30% to 60%, the sensitivity of solid fraction to temperature changes decreases and the solidification temperature decreases. From the analysis of corrosion resistance, the same solid fraction, the larger the number of solid particles, the smaller the diameter, the faster the initial corrosion rate, the less the total amount of corrosion. When the content of Al exceeds 8%, a continuous β phase is formed, inhibiting the corrosion of the semi-solid magnesium alloy. Therefore, when the content of Al is between 8% and 11%, it can not only meet the requirements of semi-solid forming but also improve the corrosion resistance of semi-solid magnesium alloy.