巻号一覧
47 巻, 7 号
選択された号の論文の7件中1～7を表示しています
- |<
- <
- 1
- >
- >|
研究論文
-
石原 知, 伊東 一彦, 近藤 幹夫, 真鍋 明, 毛利 敏洋1997 年 47 巻 7 号 p. 357-362
発行日: 1997年
公開日: 2007/03/30
ジャーナル フリーEffects of zirconium and manganese additions on microstructure and tensile property of cold worked and T6 heat-treated Al–4.5 mass%Cu–1.5 mass%Mg–0.6 mass%Mn rapidly solidified powder metallurgy (RSP) alloys were examined. The tensile strength of the Al–4.5 mass%Cu–1.5 mass%Mg–0.6 mass%Mn alloy was somewhat reduced by cold working followed by heat treatment. After the treatments, grains of the alloy were fairly coarse depending on the reduction-ratio in the cold working. TEM observations clarified that the Hall-Petch relation was maintained between 0.2% proof stress and the sub-grain diameter. The tensile strength after the treatments was hardly affected by increasing the manganese content from 0.6% to 1.2%, whereas the strength reduction after the recrystallization was effectively suppressed by adding more than 0.5% zirconium. Zirconium has a significant effect on retarding the growth rate of recrystallized grains, which is caused by homogeneous precipitation of meta-stable Al3Zr (L12) fine particles which are coherent with the matrix.抄録全体を表示PDF形式でダウンロード (1104K) -
後藤 正治, 八田 俊一, 麻生 節夫, 小松 芳成, Eckehard FROMM1997 年 47 巻 7 号 p. 363-369
発行日: 1997年
公開日: 2007/03/30
ジャーナル フリーIn order to clarify the tensile and fatigue behaviors of fiber-reinforced composite, four kinds of eutectic Al–Al3Ni materials with different inter-fiber spacings were prepard by unidirectional solidification. They were cut out to make five kinds of specimens with different angles between applied stress and fiber orientation. Their tensile and fatigue properties were compared with each other by means of a tensile test at the strain rate of 7.7×1O−5s−1 and a bending fatigue test at the strain cycle of 7 Hz and at stresses from 50 to 150 MPa in air. The results obtained are as follows. (1) The tensile properties strongly depend on the inter-fiber spacing and the fiber orientation. The tensile strength decreases with increasing inter-fiber spacing and angle between applied stress and fiber orientation. (2) The fatigue properties also strongly depend on the inter-fiber spacing and the fiber orientation. The fatigue life increases with decreasing inter-fiber spacing and angle between applied stress and fiber orientation. (3) The fatigue raito (the ratio of fatigue stress to tensile stress) does not so much depend on the inter-fiber spacing and the fiber orientation. (4) Therefore, the fatigue life is suggested to be predicted from the tensile properties of the specimen.抄録全体を表示PDF形式でダウンロード (1001K) -
大崎 修平, 飯野 牧夫, 打江 正樹1997 年 47 巻 7 号 p. 370-377
発行日: 1997年
公開日: 2007/03/30
ジャーナル フリーStress corrosion cracking (SCC) behavior of 7075 and 7175 aluminum alloys under the mixed-mode I–II loading in 3.5%NaCl solution was investigated to determine the effect of specimen orientation and mode II component on SCC extension. The mode I fracture toughness K1C is found to be strongly dependent on the orientation relative to the rolling direction, while K2C shows less pronounced anisotropy. It is also found that SCC initiation and crack growth rate in the S–L specimen is retarded by the intervension of increasing mode II component. The effect of mode II component is more pronounced in 7175 having a larger grain size in the thickness direction than 7075. The SCC extension behavior under the mixed-mode loading can be explained by a hydrogen embrittlement model incorporating hydrogen accumulation at grain boundaries with the crack tip stress condition.抄録全体を表示PDF形式でダウンロード (1250K) -
北澤 君義, 中島 明1997 年 47 巻 7 号 p. 378-384
発行日: 1997年
公開日: 2007/03/30
ジャーナル フリーThe process of CNC incremental forming is suitable for small-lot production of thin shell parts, since a variety of forming configurations can be realized by changing only the tool-path contour. A suitable tool-path schedule has been found for cylindrical shell having non-uniform wall-thickness, but has not been illuminated previously for those having uniform wall-thickness. In order to produce the cylindrical shell having uniform wall-thickness, a new tool-path schedule in which a cylindrical shell is formed from a flat blank by means of conical stretch-expanding with a single tool-path at first stage and subsequent incremental forming with parallel multi tool-path at second stage is proposed and its possibility is experimentally investigated using blanks of 1100 commercially pure aluminum sheet. It is found that the cylindrical shell having uniform wall-thickness could be formed from the aluminum blank by means of the proposed tool-path schedule. Experimental results also shows that the success of the process depends much on the condition of moving direction of tool at the second stage.抄録全体を表示PDF形式でダウンロード (1171K) -
松田 健二, 岩下 綱樹, 石動 正和, 蓮覚寺 聖一, 上谷 保裕, 池野 進1997 年 47 巻 7 号 p. 385-390
発行日: 1997年
公開日: 2007/03/30
ジャーナル フリーThe aging behavior of 17 kinds of Al–Mg2Si alloys containing various amount of Si in excess deformed after solution heated were investigated by micro-Vickers hardness, electrical resistivity and transmission electron microscopy (TEM). In Al–0.4 mass%Mg2Si alloys containing various amounts of Si in excess, the aging after deformation causes increased maximum hardness (Hmax) for all specimens. The age-hardenability (ΔH) of specimens increases by the deformation of 1% and becomes decreased by further deformation. The aging time to reach maximum hardness, tmax, becomes shortened by the deformation. The distribution and size of precipitates in the deformed specimens are denser and finer than those in specimens without any deformation. In Al–0.6 mass%Mg2Si alloys containing Si up to 0.1 mass% in excess, the aging after deformation causes increased Hmax and ΔH. While, in Al–0.6 mass%Mg2Si alloys containing Si of 0.2 to 0.4 mass% in excess, the values of Hmax remain constant with increasing amount of deformation and the values of ΔH decrease with increasing deformation over 5%. In Al–0.8 mass%Mg2Si and Al–1.0 mass%Mg2Si alloys containing Si in excess, the deformation prior to aging has no effect on Hmax, ΔH and tmax. The precipitates are finer in the alloys which exibit increased ΔH by a small amount of deformation than those of the undeformed alloys. On the contrary, the precipitates are coarsened in the alloys with decreased ΔH by deformation. A small amount of deformation causes decreased values of ΔH at 473 K and increased ΔH at 523 K in the Al–0.6 mass%Mg2Si–0.4 mass%Si alloy. In the Al–0.4 mass%Mg2Si–0.4 mass%Si alloy, however, a small amount of deformation causes increased ΔH at 473 K and decreased ΔH at 423 K.抄録全体を表示PDF形式でダウンロード (1297K) -
北澤 君義1997 年 47 巻 7 号 p. 391-395
発行日: 1997年
公開日: 2007/03/30
ジャーナル フリーIn order to improve the flaring limit of welded tubes, specimens of 5154 commercial aluminum alloy welded tube were flared to conical shapes with various half-apex angle by orbital rotary forming process, and these deformation phenomena were experimentally investigated. Experimental results showed that flaring limits are determined by the onset of cracking which propagates through the welded line from edge to root in flared tube-end. It is found that the flaring limit in orbital rotary forming is higher than that in press forming with conical dies, and that the formation of the crack can be avoided in the flaring operation by increasing inclined angle of tool and decreasing equivalent tool diameter. Improvements of the flaring limits are also observed in limiting the feed range, f≥fc, in which the flaring limit increases with decreasing f, and has maxima at fc; for f below fc, decrease in the flaring limit is caused by the low-cycle fatigue effect.抄録全体を表示PDF形式でダウンロード (569K)
解説
-
第二部 実用合金の実測値の解釈と二，三の応用小松 伸也, 藤川 辰一郎1997 年 47 巻 7 号 p. 396-406
発行日: 1997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 (1479K)
- |<
- <
- 1
- >
- >|