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Bulk Glass Formation in Eutectic of La-Cu-Ni-Al Metallic AlloysZhang, Yong, Tan, Hao, Li, Yi 01 1900 (has links)
A eutectic in La-rich La-Cu₀.₅Ni₀.₅-Al alloys was determined by studying the melting behaviors and the microstructure observations. The microstructures of the La-Cu-Ni-Al alloys prepared by Bridgman Solidification and copper mould casting were studied by using scanning electron microscope (SEM). The results show that La₆₆[Cu₀.₅Ni₀.₅]₂₀Al₁₄ alloy is very near to a pseudo-ternary eutectic. When the cooling rate is higher than 450 K/s, fully amorphous can be formed; when the cooling rate is within 15 K/s to 450 K/s, the alloy has a microstructure of dendrite plus amorphous, when the cooling rate is within 12 K/s to 1.5 K/s, the microstructures of the alloy are dendrite plus eutectic, and when the cooling rate is lower than 0.12 K/s, the morphology of the alloy is eutectic microstructure. The off eutectic alloy has better glass forming ability, the best glass forming alloy obtained at La₆₂[Cu₀.₅Ni₀.₅>]₂₄Al₁₄ along the composition line of La₈₆₋x[Cu₀.₅Ni₀.₅]xAl₁₄. It has a potential to form bulk metallic glassy rod samples with diameter larger than 12 mm. / Singapore-MIT Alliance (SMA)
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O Estudo do comportamento eletroquimico do ion La sup(3+) em meio a cloretos fundidos. A formacao de LaNi sub(5)DIAS, CRISTIANE 09 October 2014 (has links)
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08318.pdf: 5216839 bytes, checksum: a5aa91f30daca6826d66086676357dd7 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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O Estudo do comportamento eletroquimico do ion La sup(3+) em meio a cloretos fundidos. A formacao de LaNi sub(5)DIAS, CRISTIANE 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:47:41Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:08:15Z (GMT). No. of bitstreams: 1
08318.pdf: 5216839 bytes, checksum: a5aa91f30daca6826d66086676357dd7 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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