GRAIN REFINEMENT OF PURE MAGNESIUM USING ROLLED ZIRMAX® MASTER ALLOY (MG-33.3ZR)
GRAIN REFINEMENT OF PURE MAGNESIUM USING ROLLED ZIRMAX® MASTER ALLOY (MG-33.3ZR)
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DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Qian;D. S. John;M. Frost;M. Barnett
中科院分区：
文献类型：
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作者：
M. Qian;D. S. John;M. Frost;M. Barnett
由于锆在熔融镁中的溶解度有限，Zirmax®母合金（Mg-33.3Zr）中所含的几乎所有锆都以几乎纯的锆颗粒的形式存在。其中，尺寸大于5μ m的锆颗粒簇和单个锆颗粒约占微观结构中观察到的所有锆颗粒面积的70%。轧制Zirmax®母合金锭可允许一些锆颗粒簇破碎。通过在相同条件下将两种形式的中间合金添加到纯镁中，对原样Zirmax®和乳制Zirmax®中间合金之间的晶粒细化能力进行比较。发现使用轧制的Zirmax®提供了更高的总锆含量和可溶性锆含量，因此比使用原样的Zirmax®在最终合金中提供了更好的晶粒细化。轧制的Zirmax®母合金的性能改善主要归因于较不强烈的锆颗粒沉降。
Owing to the limited solubility of zirconium in molten magnesium, almost all of the zirconium contained in the Zirmax® master alloy (Mg-33.3Zr) is present in the form of nearly pure zirconium particles. Of them, zirconium particle clusters and individual zirconium particles greater than 5 m in dimension account for approximately 70% of the area of all zirconium particles observed in the microstructure. Rolling a Zirmax® master alloy ingot can allow some zirconium particle clusters to fragment. Comparisons were made of the grain-refining ability between as-received Zirmax® and rolled Zirmax® master alloys by adding both forms of master alloy to pure magnesium under the same conditions. It was found that the use of rolled Zirmax® delivered higher total and soluble zirconium contents, and therefore better grain refinement in the final alloy than did the use of as-received Zirmax®. The improved performance of rolled Zirmax® master alloy was primarily attributed to less intense zirconium particle settling.