Abnormal precipitation behavior in T6 melt-spun AlMgCu ribbon

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• 作者：Zhong-wei CHEN ; Ming-jun TANG ; Shi-shun LI ; Zong-qiang FENG
• 关键词：AlCuMg alloy ; melt spinning ; precipitation ; amorphous
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：January, 2014
• 年：2014
• 卷：24
• 期：1
• 页码：22-27
• 全文大小：644 K

文摘

The constituent of precipitations phases of aged melt-spun AlMgCu ribbons was characterized by high-resolution transmission electron microscopy and microhardness test. The cooling rate of as melt-spun ribbon was estimated to be 1.60脳10⁵ K/s from the empirical relation. The samples were aged at 200 掳C for 16 h after solution treatment. Two precipitation phases, i.e. Al₂CuMg and abnormal amorphous SiO₂ were identified in the T6 melt-spun AlMgCu ribbon. The crystal structure and stoichiometric composition of Al₂CuMg phase are in good agreement with the reference results [WANG et al (2007; 2005)]. The combined experiments show that the formation of abnormal amorphous SiO₂ appears to be associated with the higher cooling rate in melt-spinning process and has no significant effect on the peak hardness.