Effect of metal powder size on the gas expansion behavior of 7075 Al alloy in a semisolid state
Effect of metal powder size on the gas expansion behavior of 7075 Al alloy in a semisolid state
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DOI：
10.1016/j.msea.2004.04.048
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发表时间：
2004-09
期刊：
影响因子：
6.4
通讯作者：
Y. Chino;M. Mabuchi;H. Nakanishi;H. Iwasaki;A. Yamamoto;H. Tsubakino
中科院分区：
文献类型：
--
作者：
Y. Chino;M. Mabuchi;H. Nakanishi;H. Iwasaki;A. Yamamoto;H. Tsubakino
从孔隙率、孔径和孔面积的角度定量研究了由直径为25 μ m和355μm的两种粉末制备的7075铝合金在903 K半固态气体膨胀。在由0.25 μm粉末制成的样品中，孔相对均匀地形成和生长。然而，在由355μm粉末制成的试样中观察到直径超过500μm的异常大的孔隙，这是由于液相的不均匀分布。这指出了液相的均匀分布对于减少孔径偏差的重要性。
Gas expansion in a semisolid state at 903K was quantitatively investigated from the viewpoint of the porosity, pore size and pore area for two kinds of 7075 Al alloy made of ∼25 and ∼355μm powders. The pores were relatively uniformly formed and grown in a specimen made of the ∼25μm powder. However, abnormally large pores of more than 500μm in diameter were observed in the specimen made of the ∼355μm powder, resulting from the nonuniform distribution of liquid phases. This points out the importance of a uniform distribution of liquid phases to reduce deviations in pore size.