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。
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 ＆#176;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.
基金
Project(42-QP-009)supported by Research Fund of the State Key Laboratory of Solidification Processing,China
Project(Z2012019)supported by Graduate Starting Seed Fund of Northwestern Polytechnical University,China
Project(B08040)supported by the Program of Introducing Talents of Discipline to Universities("111"Project),China
