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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US >AN INVESTIGATIVE STUDY OF Si POISONING IN Al-Si ALLOYS USING THE METALLIC GLASS TECHNIQUE
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AN INVESTIGATIVE STUDY OF Si POISONING IN Al-Si ALLOYS USING THE METALLIC GLASS TECHNIQUE

机译：金属玻璃技术对Al-Si合金中Si中毒的研究

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摘要

An Al_(80)Cu_(10)Ni_8Si_2 (at. %) alloy was selected for a metallic glass study. Melt-spinning the alloy and a Al-5Ti-1B grain refiner rod resulted in heterogeneous boride particles being embedded within a glass matrix. The degree of nucleation and crystallization of the glass on borides within the matrix was controlled by the quench rate. Results indicate that Al nucleates on the borides with the close packed planes and directions being parallel: {111}Al∥{001}TiB_2, <110>Al∥<100>TiB_2. However, with a high Ti content (0.09 at. %) and with long holding times (30 minutes) a silicide phase was found nucleating on the borides: the borides displaying no evidence of nucleating Al. This silicide phase observed was not present under the previous conditions. It is proposed that the silicides consume heterogeneous nucleation sites thus preventing α-Al from nucleating. This mechanism is suggested to be the one that is commonly referred to in the literature as 'Si poisoning'. Other intermetallics were also found to nucleate on the borides.
机译：选择Al_（80）Cu_（10）Ni_8Si_2（at。％）合金进行金属玻璃研究。熔融纺丝合金和Al-5Ti-1B晶粒细化棒导致异质硼化物颗粒嵌入玻璃基质中。玻璃在基体中的硼化物上的成核和结晶程度由淬灭速率控制。结果表明，Al在硼化物上成核，其紧密堆积的平面和方向平行：{111}Al∥{001} TiB_2，<110>Al∥<100> TiB_2。但是，由于钛含量高（0.09 at。％）且保持时间长（30分钟），硅化物相在硼化物上成核：硼化物没有显示出铝成核的迹象。在以前的条件下观察不到该硅化物相。建议硅化物消耗异质形核位点，从而防止α-Al形核。有人认为这种机制是文献中通常所说的“硅中毒”。还发现其他金属间化合物在硼化物上成核。

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