Preparation and Characterization of Dual-Phase Bulk Metallic Glasses through Powder Metallurgy Route
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概要
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In the present study, amorphous Mg<SUB>49</SUB>Y<SUB>15</SUB>Cu<SUB>36</SUB> and Ti<SUB>50</SUB>Cu<SUB>28</SUB>Ni<SUB>15</SUB>Sn<SUB>7</SUB> alloy powders were synthesized separately by using a mechanical alloying technique. The dual-phase (Mg<SUB>49</SUB>Y<SUB>15</SUB>Cu<SUB>36</SUB>)<SUB>100−<I>x</I></SUB>(Ti<SUB>50</SUB>Cu<SUB>28</SUB>Ni<SUB>15</SUB>Sn<SUB>7</SUB>)<I><SUB>x</SUB></I> (<I>x</I>=0, 10, 20, 30, 40, and 50 vol%) powders were prepared by mixing the corresponding amorphous powders. The amorphous dual-phase powders were then consolidated into bulk metallic glass (BMG) discs. The amorphization status of as-prepared powders and BMG discs was confirmed by X-ray diffraction and by using a differential scanning calorimeter. The microstructure of the BMG discs showed that the Ti<SUB>50</SUB>Cu<SUB>28</SUB>Ni<SUB>15</SUB>Sn<SUB>7</SUB> phase is distributed homogeneously within the Mg<SUB>49</SUB>Y<SUB>15</SUB>Cu<SUB>36</SUB> matrix. The (Mg<SUB>49</SUB>Y<SUB>15</SUB>Cu<SUB>36</SUB>)<SUB>50</SUB>(Ti<SUB>50</SUB>Cu<SUB>28</SUB>Ni<SUB>15</SUB>Sn<SUB>7</SUB>)<SUB>50</SUB> BMG disc exhibited a relative density of 97.2% and its Vickers microhardness was 526±20 kg/mm<SUP>2</SUP>.
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The Japan Institute of Metals and Materials | 論文
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