Preliminary Study on Aluminium-based Nanophase Composites Al_(88)Ni_(10)Y_2 and Al_(88)Ni_8Y_4 |
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摘 要: |
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收稿时间: | 1996-01-28 |
Preliminary Study on Aluminium-based Nanophase Composites Al_(88)Ni_(10)Y_2 and Al_(88)Ni_8Y_4 |
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Authors: | Z CZhong and AL Greer |
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Affiliation: | Z. C.Zhong and A.L. Greer(Dept. of Materials Science & Metallurgy,University of Cambridge,Pembroke Street,Cambridge CB QZ,UK) |
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Abstract: | A new kind of aluminium-based alloy part amorphous/part crystalline, can be produced directlyby rapid quenching of the liquid. These materials have a novel structure of nanometer-sizedcrystals in an amorphous matrix and quite remarkable mechanical properties. The materialscan be considered to be nanophase composites. In this work Al88Ni10Y2 and Al88Ni8Y4 (atpct) nanophase composites consisting of a nanoscale dispersion of fcc-Al crystallites uniformlydispersed in an amorphous matrix, have been produced by melt-spinning. They have much highermicrohardness HV than fully amorphous alloys with the same composition. while retaining goodbending ductility The volume fraction, crystallite size and distribution of the fcc-Al phase havebeen estimated by DSC. X-ray diffraction and TEM. lt is found that the microstructure andproperties of the nanophase composites are very sensitive to the composition and the quenchingconditions. lncreasing the Y contedt and decreasing the Ni content at a given Al content givesmuch smaller dispersed nanophase aluminium crystallites. The volume fraction and crystallitesize of the fcc-Al phase increase with a decrease of wheel speed (quenching rate). The effectsof Y and Ni contents on the ease of formaticn of the nanophase composites are discussed. Theorigins of the novel mechanical properties are also considered. |
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