Modification of eutectic silicon in Al-Si alloys
Modification of eutectic silicon in Al-Si alloys
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DOI：
10.1007/s10853-008-2505-5
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发表时间：
2008-05-01
影响因子：
4.5
通讯作者：
Prabhu, K. Narayan
中科院分区：
文献类型：
--
作者：
Hegde, Sathyapal;Prabhu, K. Narayan
Al-Si合金的力学性能与显微组织中共晶硅的大小、形状和分布密切相关。为了提高合金的力学性能，通常对合金进行变质处理，使针状硅形态转变为纤维状，从而显著提高合金的延伸率和强度。熔体处理工艺不当、改性剂褪色、中毒等，往往会导致结构偏离理想。因此，在浇注前评估熔体处理的有效性至关重要。一种可靠的热分析技术通常用于此目的。在热分析中偏离标准曲线有助于评估Si结构的细化水平。在本综述中，试图讨论改性的各个方面，包括机制，缺陷的相互作用和非破坏性评估的热分析。
The mechanical properties of Al-Si alloys are strongly related to the size, shape and distribution of eutectic silicon present in the microstructure In order to improve mechanical properties, these alloys are generally subjected to modification melt treatment, which transforms the acicular silicon morphology to fibrous one resulting in a noticeable improvement in elongation and strength. Improper melt treatment procedures, fading and poisoning of modifiers often result in the structure which is far from the desired one. Hence it is essential to assess the effectiveness of melt treatment before pouring. A much investigated reliable thermal analysis technique is generally used for this purpose. The deviation from the standard curve in thermal analysis helps in assessing the level of refinement of the Si structure. In the present review an attempt is made to discuss various aspects of modification, including mechanism, interaction of defects and non-destructive assessment by thermal analysis.