巻号一覧
53 巻, 3 号
選択された号の論文の7件中1～7を表示しています
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研究論文
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菅藤 昭良, 田上 道弘, 白坂 康広, 佐藤 淳2003 年 53 巻 3 号 p. 93-97
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーSome alloys of Al–Si–Cu–Mg system were made by the gravity casting to develop alloys with the good wear resistance in boundary lubrication. The effects of silicon and copper contents on the sliding properties of aluminum casting alloys were investigated by the endurance test and the load carrying capacity test in the radial thrust rubbing test method. As the results, lower coefficient of friction were obtained at the alloy compositions of 23 mass%Si and 3 or 6 mass%Cu by the endurance test. On the other hand, higher the load carrying capacity of 2.5 MPa was obtained at the alloy composition of 23 mass%Si, 6 mass%Cu, 1 mass%Mg and balance Al. That was about three times compared with ADC 14 used with wear resistance alloy. Furthermore, it was found that the silicon contents range from 23 mass% to 30 mass% shows constant dispersion of the primary silicon of fine particles having effects on wear-resisting. And in the Al–23 mass%Si–6 mass%Cu–1 mass%Mg alloy, the micro-regions among the primary silicon led to more effect on improvement of the load carrying capacity because of the formation of lubricants bases.抄録全体を表示PDF形式でダウンロード (500K) -
酒井 孝, 星合 壮大, 仲町 英治2003 年 53 巻 3 号 p. 98-103
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーTitanium (Ti) thin films were created on glass and Pb(Zr–Ti)O3 (PZT) substrates using magnetic RF sputtering apparatus. Nano-indentation tests were carried out to study the influence of the Ti thin layer on piezoelectric properties. The piezoelectric properties of the PZT plate and a Ti sputtered one were also measured by laser Doppler vibrometer. Furthermore, some characteristics, such as crystalline structure, depth profiles, and surface roughness of the films were observed by means of an atomic force microscope (AFM). Main conclusions obtained in this study are summarized as follows: (1) From detailed observation and analytical results of AFM, the surface roughness, Ra, tends to increase as Ti film thickness is increased. (2) Several mechanical properties, such as reduced modulus Er and hardness H obtained from nano-indentation tests, are significantly related to film thickness. (3) Piezoelectric response properties are present in as-received PZT specimens and Ti-sputtered PZT specimens. Experimental and FE analytical results indicate that the piezoelectric coefficient is significantly influenced by Ti layer.抄録全体を表示PDF形式でダウンロード (455K) -
中川 惠友, 金谷 輝人, 伊藤 吾朗, 細川 智生, 谷本 雅2003 年 53 巻 3 号 p. 104-109
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーEffects of aging at 473 K on the relationship between microstructure and fatigue strength for an Al–4%Ge alloy has been investigated. The fatigue strength is lowered with increasing aging time. The fatigue life is deduced to be greatly affected by the initiation of the crack since the present fatigue test condition is in a high-cycle range. The crack is likely to initiate at the coarse precipitate located at the intersection between the free surface and grain boundary. This mechanism can explain the reduction in fatigue strength with increasing aging time, that is, with the increase in the size of the coarse precipitate.抄録全体を表示PDF形式でダウンロード (562K) -
山本 雄一郎, 山本 厚之, 椿野 晴繁, 寺澤 倫孝, 三田村 徹, 木野村 淳, 堀野 裕治2003 年 53 巻 3 号 p. 110-113
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーSurface segregation of iron in high purity aluminum alloys, containing 50 and 280 ppm iron, was investigated by Rutherford back scattering spectroscopy (RBS) and transmission electron microscopy (TEM). The specimens were heat treated at various temperatures ranging from 423 K to 923 K for 72 ks in Ar atmosphere. The surface segregation of iron by heat treatment was detected by RBS measurement. The strongest segregation was observed in the Al–280 ppmFe annealed at 723 K for 72 ks. The surface segregation quantities in Al–50 ppmFe alloy was smaller than those in Al–280 ppmFe alloy, but the degree of segregation (segregation concentration/bulk concentration) in Al–50 ppmFe alloy was larger than that in Al–280 ppmFe alloy. TEM–EDX indicated that almost of iron segregated at the interface between oxide film and the matrix, but a few iron in the oxide films just above aluminum matrix was detected.抄録全体を表示PDF形式でダウンロード (398K) -
伊藤 勉, 石川 真之, 大塚 正久, 佐賀 誠, 菊池 正夫2003 年 53 巻 3 号 p. 114-120
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーAl–Mg–Si alloys have recently been used for both automotive body sheet panel in order for weight saving. However, this is partially caused by poor press formability in these alloys, though both specific stiffness and strength are sufficiently high. In this paper, the high temperature characteristics of two kinds of 6XXX aluminum alloy rolled sheets in T4 condition have been investigated with special reference to the applicability to superplastic forming. Constant cross head speed tensile tests were conducted at temperature and initial strain rate ranging from 623 K to 803 K and from 1×10−5s−1 to 1×10−1s−1, respectively. The total elongation vs. strain rate diagram has a minimum of 150% near the strain rate 1×10−3s−1 both at 773 K and at 803 K. It is to be noted that the dominant deformation mechanism changes from grain boundary sliding in lower strain rate range to transgranular deformation in higher strain rate range. Total elongation increases rapidly with decrease in strain rate resulting in superplastic elongation more than 300%. The deformation mechanism is discussed on the basis of rate controlling processes. The anisotropy in ductility is also examined.抄録全体を表示PDF形式でダウンロード (484K)
解説
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世利 修美2003 年 53 巻 3 号 p. 121-129
発行日: 2003年
公開日: 2007/03/30
ジャーナル フリーPDF形式でダウンロード (536K)
連載講座
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大園 智哉2003 年 53 巻 3 号 p. 130-137
発行日: 2003/03/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (632K)
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