Synthesis and analysis of nanocrystalline β₁-Cu₃Al and β₂-NiAl intermetallic-reinforced aluminum matrix composite by high energy ball milling

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• 作者：Hong-Hai Nguyen ; Minh-Thuyet Nguyen ; Won Joo Kim…
• 关键词：mechanical alloying/milling ; nanostructured materials ; crystal structure ; transmission electron microscopy (TEM)
• 刊名：Metals and Materials International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：23
• 期：1
• 页码：202-206
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials; Operating Procedures, Materials Treatment; Magnetism, Magnetic Materials; Engineering Thermodynamics, Heat and Mass Transfer; Characterization and Evaluation of Materials; Continuu
• 出版者：The Korean Institute of Metals and Materials
• ISSN：2005-4149
• 卷排序：23

文摘

Nanocrystalline β₁-Cu₃Al and β₂-NiAl intermetallic compounds were in-situ reinforced in the aluminum matrix with the atomic composition of Al₆₇Cu₂₀Ni₁₃ by the mechanical alloying of elemental powders. Both β₁-Cu₃Al, β₂-NiAl phases that can be only co-synthesized in Cu base alloys have been obtained after 15h milling in this study. The phase evolution during milling process was investigated by X-ray diffraction. The β₁-Cu₃Al, β₂-NiAl phases were metastable with further milling time up to 40 h. Specially, unreacted Al matrix has been totally transformed to amorphous state in the final powder. A remarkable crystalline size of 6.5 nm was reached after 15 h milling time. Thermal stability of the milled powder was also studied by differential thermal analysis. It is shown that β₁-Cu₃Al, β₂-NiAl phases were stable up to higher than 550 °C. Moreover, the inter-diffusion between Al matrix and Cu₃Al within the temperature range of 620-740 °C led to the formation of superstructure ζ₁-Al₃Cu₄ phase.