準結晶を含む急冷Al-Cr合金のMGによるアモルファス化とパルス通電焼結によるバルク化 [in Japanese] Amorphization of rapidly solidified Al-Cr alloy with quasicrystal by mechanically grinding and preparing bulk material by pulsed current sintering [in Japanese]
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An Al-Cr amorphous powder prepared by mechanically grinding a rapidly solidified ribbon was consolidated by pulsed current sintering at lower temperature than the crystallization temperature. The rapidly solidified Al<SUB>100-x</SUB>Cr<SUB>x</SUB>(x=5-15) ribbons were prepared by single roll method. The quasicrystalline phase existed in the 7-13at%Cr ribbons. By mechanically grinding, the amorphous phase was formed in the powder of 10-15at%Cr. The analysis by XRD and DSC revealed that the mechanically ground Al<SUB>87</SUB>Cr<SUB>13</SUB> and Al<SUB>85</SUB>Cr<SUB>13</SUB> powders were a single amorphous phase. Al<SUB>90</SUB>Cr<SUB>10</SUB> powder consisted of the Al phase and the amorphous phase. A disk specimen of 10mm in diameter was prepared by sintering at 500MPa pressure at 573K with a hard metal die. The consolidated Al<SUB>90</SUB>Cr<SUB>10</SUB> had the porosity of 3.3%, while Al<SUB>87</SUB>Cr<SUB>13</SUB> had the porosity of 20.7%. The marked difference between them is resulted from the mass flow of the Al in the Al<SUB>90</SUB>Cr<SUB>10</SUB> sample to the triple points among the particles.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 45(11), 1076-1080, 1998-11-15
Japan Society of Powder and Powder Metallurgy