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The Vickers hardness test is a widely used indentation method for determining the hardness of metals, alloys, ceramics, and surface-treated materials. The test employs a diamond indenter in the shape of a square-based pyramid with an angle of 136° between opposite faces. This geometry ensures that the hardness value is nearly independent of ____ _______ _____ ________ _________ ___ _______ _____.
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