Effects of multiple strengthening treatments （i.e. ag mechanical properties and stability of nanoscale prec in this research. Various tests such as hardness, tensi ng either at three or four consecutive temperatures...Effects of multiple strengthening treatments （i.e. ag mechanical properties and stability of nanoscale prec in this research. Various tests such as hardness, tensi ng either at three or four consecutive temperatures） on pitated phases in an AA2090 alloy have been evaluated e, electrical resistance, differential scanning calorimetric （DSC）, and transmission electron microscopy （TEM） have been performed. The results show that the ultimate tensile strength （UTS） and the yield strength of the samples aged at four consecutive temperatures （i.e. natural aging＋190℃＋150℃＋100℃） can be increased approximately to 660 and 610 MPa, respectively. It is also found that precipitation of T1 phase occurs during multiple aging process of the alloy and the higher amounts of enthalpies shown in DSC charts are linked to higher volume fraction of this precipitate. Furthermore, TEM observations reveal that T1 phase has plate shape morphology and its crystal structure is in the form of hcp with lattice parameters of a=0.467 nm and c=0.878 nm.展开更多
Ichiyou Higuchi was a legendary woman writer during the reign of MEIJI in Japan. Although her works are difficult to understand, they have been quite popular up to the present. There are various opinions toward her an...Ichiyou Higuchi was a legendary woman writer during the reign of MEIJI in Japan. Although her works are difficult to understand, they have been quite popular up to the present. There are various opinions toward her and her works. The article proposes from another point of view that the mental qualities and literary status of her and her works, as being in the crevice among two or more different tides, have such features as inter-space, transition and vacillation which are the essence of her and her works.展开更多
文摘Effects of multiple strengthening treatments （i.e. ag mechanical properties and stability of nanoscale prec in this research. Various tests such as hardness, tensi ng either at three or four consecutive temperatures） on pitated phases in an AA2090 alloy have been evaluated e, electrical resistance, differential scanning calorimetric （DSC）, and transmission electron microscopy （TEM） have been performed. The results show that the ultimate tensile strength （UTS） and the yield strength of the samples aged at four consecutive temperatures （i.e. natural aging＋190℃＋150℃＋100℃） can be increased approximately to 660 and 610 MPa, respectively. It is also found that precipitation of T1 phase occurs during multiple aging process of the alloy and the higher amounts of enthalpies shown in DSC charts are linked to higher volume fraction of this precipitate. Furthermore, TEM observations reveal that T1 phase has plate shape morphology and its crystal structure is in the form of hcp with lattice parameters of a=0.467 nm and c=0.878 nm.
文摘Ichiyou Higuchi was a legendary woman writer during the reign of MEIJI in Japan. Although her works are difficult to understand, they have been quite popular up to the present. There are various opinions toward her and her works. The article proposes from another point of view that the mental qualities and literary status of her and her works, as being in the crevice among two or more different tides, have such features as inter-space, transition and vacillation which are the essence of her and her works.
