Size effects in aluminium alloy castings
Size effects in aluminium alloy castings
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铝合金铸件的尺寸效应
DOI：
10.1016/j.actamat.2010.01.032
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发表时间：
2010
期刊：
影响因子：
9.4
通讯作者：
A. Benzerga
中科院分区：
文献类型：
--
作者：
Qigui Wang;M. Praud;A. Needleman;Kyung;J. Griffiths;C. Davidson;C. H. Cáceres;A. Benzerga
Benzerga等人（Acta Mater 2001; 49：3071）发现，与具有粗二次枝晶臂间距（SDAS）的铸件相比，具有细二次枝晶臂间距（SDAS）的铸件的Al-7Si-0.3Mg铸件的屈服强度较小。本文回顾了Al-Si-Mg合金铸件以往的实验数据，并对Benzerga等人的原始铸件和其微观结构更符合Benzerga等人理论模型的Al-Si二元合金铸件进行了新的实验。实验结果表明，Benzerga等人报告的逆尺寸效应是对原始铸件进行不同热处理的结果，而不是任何内在的尺寸效应。目前的结果证实，可热处理（Al-Si-Mg）和不可热处理（Al-Si）铸件中的小尺寸效应可以忽略不计。
A finding by Benzerga et al. (Acta Mater 2001; 49:3071) that the yield strength of Al–7Si–0.3Mg castings is smaller for castings with a fine secondary dendrite arm spacing (SDAS) than for those with a coarse SDAS is revisited. Previous experimental data for Al–Si–Mg castings are reviewed, and new experiments carried out, both on the original castings used in Benzerga et al. and on Al–Si binary alloy castings whose microstructures more closely conform to the theoretical model of Benzerga et al. The experimental results show that the inverse size effect reported by Benzerga et al. was a consequence of different heat-treatments applied to the original castings, rather than to any intrinsic size effect. The present results confirm that there is a negligibly small size effect in both heat-treatable (Al–Si–Mg) and non-heat-treatable (Al–Si) castings.