本工作用室温及高温 X 射线衍射分析,热学分析和红外吸收光谱等实验方法,对 Li_2O-B_2O_3体系中各化合物试样进行了玻璃晶化和相变研究,探讨了晶化机制和相变规律.对其中一些化合物发现了新的物相,修正了前人工作的 Li_2O-B_2O_3体系的...本工作用室温及高温 X 射线衍射分析,热学分析和红外吸收光谱等实验方法,对 Li_2O-B_2O_3体系中各化合物试样进行了玻璃晶化和相变研究,探讨了晶化机制和相变规律.对其中一些化合物发现了新的物相,修正了前人工作的 Li_2O-B_2O_3体系的相图.展开更多
To identify the re-arrangement of constituent atoms of an amorphous Mg65Cu25Gd10 alloy happened with annealing, structure relaxation of the alloy was investigated as a function of an- nealing time at 373 K through ext...To identify the re-arrangement of constituent atoms of an amorphous Mg65Cu25Gd10 alloy happened with annealing, structure relaxation of the alloy was investigated as a function of an- nealing time at 373 K through extended X-ray absorption fine structure （EXAFS） analysis procedures. To understand the effect of structure relaxation on strength, compression tests were conducted for both the as-cast and the annealed Mg65Cu25Gd10 samples. It is found that short range order around Cu and Gd atoms exhibits different variation trends with increasing annealing time at 373 K, though the structure of the alloy still remains to be amorphous. Based on the fact that the strength of the alloy first exhibits a reduction and then a recovery with annealing time, it is suggested that the enhancement of short range order around Cu should be responsible for the strength reduction, while the enhancement of short range order around Gd should be responsible for the strength recovery.展开更多
基金Funded by National ‘863’ Program (No. 2003AA305071)
文摘To identify the re-arrangement of constituent atoms of an amorphous Mg65Cu25Gd10 alloy happened with annealing, structure relaxation of the alloy was investigated as a function of an- nealing time at 373 K through extended X-ray absorption fine structure （EXAFS） analysis procedures. To understand the effect of structure relaxation on strength, compression tests were conducted for both the as-cast and the annealed Mg65Cu25Gd10 samples. It is found that short range order around Cu and Gd atoms exhibits different variation trends with increasing annealing time at 373 K, though the structure of the alloy still remains to be amorphous. Based on the fact that the strength of the alloy first exhibits a reduction and then a recovery with annealing time, it is suggested that the enhancement of short range order around Cu should be responsible for the strength reduction, while the enhancement of short range order around Gd should be responsible for the strength recovery.
