巻号一覧
30 巻, 11 号
選択された号の論文の9件中1～9を表示しています
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市川 理衛1980 年 30 巻 11 号 p. 607-608
発行日: 1980/11/30
公開日: 2008/07/23
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鈴木 寿, 菅野 幹宏, 伊藤 吾朗1980 年 30 巻 11 号 p. 609-616
発行日: 1980/11/30
公開日: 2008/07/23
ジャーナル フリーTwo-step aging phenomena in an Al-1.17%Mg2Si alloy pre-aged at 20-100°C and finally aged at 175°C were studied by means of hardness anal electrical resistivity measurements and transmission electron microscopy. The positive effect of two-step aging is visualized only for pre-aging at 100°C, and in this case, hardness drop or coarsening of G.P. zones is never found under the condition of short time pre-aging. The number of clusters formed during pre-aging increases with lowering pre-aging temperatures. The clusters do not easily change into G.P. zones during final aging and almost remain unchanged for a prolonged time, as pre-aging temperatures lower. These facts are incompletely understood basing on the previous model so far proposed. It is likely that the effect of two-step aging in this alloy is related to the structure difference between clusters and G.P. zones. The difference is reduced with increasing pre-aging temperatures, so that the clusters change into the zones more easily accompained with the positive effect.抄録全体を表示PDF形式でダウンロード (1945K) -
堀 茂徳, 古城 紀雄, 藤谷 渉1980 年 30 巻 11 号 p. 617-625
発行日: 1980/11/30
公開日: 2008/07/23
ジャーナル フリーChill cast Al-0 to 5%Hf alloys were examined. Hf up to 3% is soluble in chill cast solid aluminum. The alloys containing Hf3.5% or more have a non-equilibrium Ll2 structure. The metastable Al3Hf plays an active nucleolus for the angular structure and leads to remarkable grain refining in aluminum. The metastable Al3Hf with Ll2 structure continuously and discontinuously precipitates from the super saturated solid solution during tempering. The spherical continuous precipitates considerably harden the alloys. The cold rolled Al-3.5 and 4%Hf alloys have a structure stable at elevated temperatures. This fact is based on locking of dislocations by precipitated metastable particles finely dispersed.抄録全体を表示PDF形式でダウンロード (2656K) -
武井 広見, 佐藤 謙一, 横田 稔1980 年 30 巻 11 号 p. 626-633
発行日: 1980/11/30
公開日: 2008/07/23
ジャーナル フリーEffects of Fe concentration in solid solution and of a dispersed phase on work softening and recrystallization of Al-0.12 to 2.85%Fe alloys were investigated. The 0.2% proof stress of the Al-Fe drawn wire rapidly increases at the early stage of deformation. Work hardening of the alloys containing high concentration of Fe in solid solution is unchanged in the heavy deformation region. The alloys containing low concentration of Fe in solid solution are susceptive to work softening. The half softening temperature at isochronal annealing drastically drops with dilution of Fe in solid solution and with increase of the dispersed phase and cold working ratio. The cellular structure is developed in the cold worked alloys of high Fe concentration in solid solution. Recrystallized grains are observed near the precipitates in the alloys of low Fe concentration in solid solution.抄録全体を表示PDF形式でダウンロード (2099K) -
本橋 嘉信, 柴田 孝夫1980 年 30 巻 11 号 p. 634-642
発行日: 1980/11/30
公開日: 2008/07/23
ジャーナル フリーTension tests at 4.2 to 523K were carried out at different strain rates on the alloys having various grain sizes from 0.87 to 3.89μm. Some empirical relations are found among tensile stress σuy, strain rate ε, temperature T and grain size L. A relation σuy-σj∝L holds in a high temperature region, where σj is the stress at L=0. The alloys superplastically deform in this region. The experimental data obey the phenomenological and mechanical equation of state for superplasticity: ε=K[(σuy-σj)/L]nexp(-U/RT), where U is the activation energy, R the gas constant and K a constant. The Hall-Petch relation σuy∝L-1/2 holds in a low temperature region. Superplastic features are hardly observed. A transition region from superplastic to normal deformation is found at intermediate temperatures. This region moves to high temperature side as the grain size increases.抄録全体を表示PDF形式でダウンロード (1212K) -
田上 道弘, 熊田 秋男1980 年 30 巻 11 号 p. 643-647
発行日: 1980/11/30
公開日: 2008/07/23
ジャーナル フリーEffects of specimen size, strain rate and pore diameter on the fracture toughness of ADC10 die castings were studied by a double torsion bending test procedure. The specimen size and strain rate have little effect on the fracture toughness. The value KIC is independent of the pore diameter from 0.1 to 0.5mm in the section of specimen. ADC10 die castings have fracture toughness 20% greater than that of the gravity die castings.抄録全体を表示PDF形式でダウンロード (1324K) -
田上 道弘, 芹田 陽, 時田 俊彦1980 年 30 巻 11 号 p. 648-652
発行日: 1980/11/30
公開日: 2008/07/23
ジャーナル フリーEffects of aging treatment and rolling reduction on the fracture toughness of Na-modified Al-10%Si-3%Cu-0.3%Mg alloy castings were studied by a double torsion tending test procedure. The fracture toughness is appreciably affected by the aging treatment. The casting aged at 147°C for 10hr has the highest fracture toughness over the range of test temperatures. Rolling reduction 30% results in the fracture toughness improved by 10 to 20%. Increase of rolling reduction up to 56% improves the fracture toughness not so significantly. A linear relationship is found between KIc and n√σy derived from the tensiltest when aged under different conditions.抄録全体を表示PDF形式でダウンロード (978K) -
菅野 幹宏, 鈴木 寿1980 年 30 巻 11 号 p. 653-663
発行日: 1980/11/30
公開日: 2008/07/23
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藤倉 潮三1980 年 30 巻 11 号 p. 664-675
発行日: 1980/11/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (1677K)
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