介绍了含长周期堆垛有序结构(Long period stacking order,简称LPSO结构)的Mg-RE-Zn(-Zr)合金的研究现状,重点分析了Mg-Gd-Zn(-Zr)合金中14H-LPSO结构的最新研究进展,综述了等通道角挤压和搅拌摩擦加工工艺在镁合金强韧化中的应用现状,...介绍了含长周期堆垛有序结构(Long period stacking order,简称LPSO结构)的Mg-RE-Zn(-Zr)合金的研究现状,重点分析了Mg-Gd-Zn(-Zr)合金中14H-LPSO结构的最新研究进展,综述了等通道角挤压和搅拌摩擦加工工艺在镁合金强韧化中的应用现状,提出了当前Mg-Gd-Zn(-Zr)合金研究需解决的主要问题和未来研究方向,展望了等通道角挤压和搅拌摩擦加工工艺在Mg-Gd-Zn(-Zr)合金强韧化方面的应用前景。展开更多
It was demonstrated that some level of order exists in glassy poly(ethylene terephthalate) by depolarized light intensity(DLI) technique, but this order is different from that in crystalline PET. The degree of order i...It was demonstrated that some level of order exists in glassy poly(ethylene terephthalate) by depolarized light intensity(DLI) technique, but this order is different from that in crystalline PET. The degree of order in glassy PET decrease with increasing temperature between 288-343 K. The active energy of this transition is about 22 56 kJ/mol. The IR analysis indicated that this order relates to gauche structure of the ethyleneglycol fragments. The decrease of order with temperature comes from the increase of distance between the order segments.展开更多
文摘介绍了含长周期堆垛有序结构(Long period stacking order,简称LPSO结构)的Mg-RE-Zn(-Zr)合金的研究现状,重点分析了Mg-Gd-Zn(-Zr)合金中14H-LPSO结构的最新研究进展,综述了等通道角挤压和搅拌摩擦加工工艺在镁合金强韧化中的应用现状,提出了当前Mg-Gd-Zn(-Zr)合金研究需解决的主要问题和未来研究方向,展望了等通道角挤压和搅拌摩擦加工工艺在Mg-Gd-Zn(-Zr)合金强韧化方面的应用前景。
文摘It was demonstrated that some level of order exists in glassy poly(ethylene terephthalate) by depolarized light intensity(DLI) technique, but this order is different from that in crystalline PET. The degree of order in glassy PET decrease with increasing temperature between 288-343 K. The active energy of this transition is about 22 56 kJ/mol. The IR analysis indicated that this order relates to gauche structure of the ethyleneglycol fragments. The decrease of order with temperature comes from the increase of distance between the order segments.
