巻号一覧
57 巻, 10 号
選択された号の論文の6件中1～6を表示しています
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研究論文
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西田 進一, 本村 貢2007 年 57 巻 10 号 p. 439-443
発行日: 2007年
公開日: 2007/11/30
ジャーナル フリーThe purpose of this study is to produce magnesium alloy strip of good quality at lower cost than the conventional rolled sheet. Melt drag process has many advantages such as the low production cost and the improved microstructure because the strip is made directly from molten metal by rapid cooling. In this study, we designed the experimental device for molten magnesium casting and researched the effects of the basic factors such as roll speed, pouring temperature and melt height on surface quality, strip thickness, Vickers hardness and microstructure. The AZ31 magnesium alloy strip was able to be produced at roll speed from 1 m/min to 90 m/min, and the thickness changed from 0.5 mm to 8.8 mm. The higher the pouring temperature, the thinner the strip thickness became. And the higher the melt height, the thicker the strip thickness became. The Vickers hardness is about 47HV. The microstructure of the produced strip was equiaxed and the distribution of crystal grain size was relatively uniform. The average crystal grain size was from 50 μm to 300 μm depending on the experimental conditions.抄録全体を表示PDF形式でダウンロード (1848K) -
徳田 健二, 熊井 真次, 鈴木 健太, 石原 暁子, 羽賀 俊雄2007 年 57 巻 10 号 p. 444-449
発行日: 2007年
公開日: 2007/11/30
ジャーナル フリーInfluence of iron content (0.2–1.0 mass%) and solidification rates (3–1200°C/s) during casting on mechanical properties of 6022 base aluminum alloys were investigated. Molten alloys were cast into about 3 mm thick plate by a vertical-type high-speed twin-roll caster (HSTRC) . Conventional book-type mold casting with a thickness of 5 mm and 50 mm were also fabricated for a purpose of comparison. The castings were rolled into 1 mm-thick sheets and then heat-treated. Iron content had a small effect on tensile strength of the sheet for both T4 temper and after baking-treated conditions. While, elongation decreased with increasing iron content. Solidification rates also had a small effect on the strength, though HSTRC sheet exhibited a little higher strength. This is considered to be due to higher solute content in the Al matrix of the rapidly solidified HSTRC product. Bendability was also deteriorated with the increase of iron content. It was remarkable for the sheet produced from the 50 mm-thick plate with the low solidification rate. Improved bendability of the sheets fabricated from high solidification rate products (HSTRC and 5 mm-thick plate) was considered to be mainly due to the finer second phase particles.抄録全体を表示PDF形式でダウンロード (1594K) -
田村 洋介, 柳澤 毅, 気田 悠作, 為広 博, 河野 紀雄, Hiroshi SODA, Alexander McLean2007 年 57 巻 10 号 p. 450-456
発行日: 2007年
公開日: 2007/11/30
ジャーナル フリーA Mg–9%Al–1%Zn ternary alloy was prepared from high purity magnesium, aluminum, and zinc. The precipitation and age hardening characteristics of the alloy and the mechanical properties of as-cast, solution heat-treated, and aged specimens were compared with those of a commercial AZ91 alloy containing manganese. Active growth of discontinuous precipitates that occupied the majority of the grain areas was observed in the high purity alloy, while in the commercial alloy, growth of the discontinuous precipitates ceased after the early stage of the precipitation process, resulting in only about 20% of the grain areas being occupied by the discontinuous precipitates and the remainder occupied by continuous precipitates. These differences in the microstructure were reflected in the peak hardness of the alloys. It was also found that there was preferential precipitation of the β-phase in the areas of the grains that were richer in manganese. Thus, these results showed that manganese promotes the precipitation of the β-phase within the grains while hindering the growth of discontinuous precipitates. From measurements of the room temperature tensile properties of as-cast, solution-treated, and aged specimens of the high purity and commercial alloys, it was found that the high purity alloy exhibited higher yield strength, tensile strength, and elongation in the aged condition and higher elongation after solution heat treatment compared to the corresponding properties of samples from the commercial alloy.抄録全体を表示PDF形式でダウンロード (3749K) -
世利 修美, 福地 智2007 年 57 巻 10 号 p. 457-460
発行日: 2007年
公開日: 2007/11/30
ジャーナル フリーIn order to improve of corrosion resistance of commercial aluminum 1100, preferential removal of FeAl3 intermetallic compound particles on the 1100 surface and oxide film anodized after particles-free surface has been studied. The polarization curve of specimen with intermetallic particles has the pitting potential about −400 mV vs. SSE, but the polarization curve of anodized specimen without intermetallic compound particles has not pitting potential in the curve. It is found that the surface of aluminum alloy 1100 without intermetallic compound particles has been successfully anodized and shown excellent corrosion-resistance performance.抄録全体を表示PDF形式でダウンロード (1669K)
解説：軽金属学会賞
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長村 光造2007 年 57 巻 10 号 p. 461-478
発行日: 2007年
公開日: 2008/01/30
ジャーナル フリーPDF形式でダウンロード (2996K)
連載講座
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髙橋 和仁, 村田 眞2007 年 57 巻 10 号 p. 479-486
発行日: 2007/10/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (1026K)
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