What is it about?

it is talking about whether shearing the melt above iquidus would end up to better structure or shearing at below liquidus.

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Why is it important?

it suggests shearing above liquidus via cavitation could end up to better structure

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This page is a summary of: A Comparison of Grain Refinement Efficiency by Shearing above and below the Liquidus, Solid State Phenomena, September 2014, Trans Tech Publications,
DOI: 10.4028/www.scientific.net/ssp.217-218.23.
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