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The effect of substituting standard grade zirconium lump (99.8% excluding up to 4% hafnium) for high purity zirconium crystal bar (99.5%) in a Cu43Zr43Al7Be7 bulk metallic glass (BMG) is examined. The final hafnium content in the BMG specimens was found to range from 0 to 0.44at%. Introducing low purity zirconium significantly decreased the glass-forming-ability and reduced the notch toughness of...
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