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Addition of 0.08wt%Ca into AZ31 melts significantly reduces the average grain size of thin strips produced by twin-roll-cast to 30μm from 100μm. Like Zr, due to the high chemical activity, the Ca added into the melts reacts with Al and forms Al 2 Ca intermetallic compound. X-ray diffraction result approves the existence of Al 2 Ca in the thin strips, which formed in the melts. Crystallographic...
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