T6态AlMgCu铝合金激冷甩带的反常析出行为

来源期刊:中国有色金属学报(英文版)2014年第1期

论文作者:陈忠伟 汤明军 李士顺 冯宗强

文章页码:22 - 27

关键词:AlCuMg 合金;熔体激冷;析出;非晶

Key words:AlCuMg alloy; melt spinning; precipitation; amorphous

摘    要:利用高分辨透射电镜和硬度测试表征时效态AlMgCu铝合金激冷甩带的析出相组成。铸态合金甩带的冷却速率通过经验公式计算为1.60×105 K/s。T6态热处理是试样经固溶处理后再进行200 °C保温16 h的时效处理。结果表明,T6态AlMgCu铝合金激冷甩带含有Al2CuMg相和反常非晶SiO2两种析出相。Al2CuMg 析出相的晶体结构和成分配比与文献[Wang et al.(2007; 2005)]结果一致。综合实验结果分析表明,反常非晶SiO2 相的析出可能与激冷甩带具有高的冷却速率有关,它的析出对其硬度的影响不大。

Abstract: 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 1.60×105 K/s from the empirical relation. The samples were aged at 200 °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.

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