Amorphous Al2O3 coatings show steadily decreasing hardness but constant Young's modulus from 25-650C, remain non-crystalline, and crystallize via intermediate phases to stable alpha-Al2O3 above 950C.
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High-temperature behavior of amorphous alumina coatings: Insights from in-situ nanoindentation and X-ray diffraction studies
Amorphous Al2O3 coatings show steadily decreasing hardness but constant Young's modulus from 25-650C, remain non-crystalline, and crystallize via intermediate phases to stable alpha-Al2O3 above 950C.