巻号一覧
43 巻, 8 号
選択された号の論文の8件中1～8を表示しています
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青柳 成俊, 河原 一郎, 中川 昌也, 小島 陽1993 年 43 巻 8 号 p. 403-409
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーHigh temperature strength of SiC whisker reinforced AC4A aluminum alloy composite, and the boundary strength between matrix part and composite part were examined. The composites were fabricated by melting infiltration method using a die-casting machine. High temperature strengths of composite and matrix parts were measured by 3-point bending test at 293K, 273K, 473K, 523K, 573K and 623K under as-cast conditions. The boundary strength was measured by 4-point bending test at room temperature after heat treatments at 293K, 373K, 473K, 573K and 623K for 3600 seconds in vacuum. The composite strength up to 473K is approximately 810MPa which is equal to 1.5 times of matrix strength, and even when the test temperature is increased to 623K from 473K, the composite strength is still held to be more than 500MPa. Up to a heat treatment temperature of 473K, the boundary strength, about 480MPa, is equal to a half of the composite strength and lower than the matrix strength by 25%. When the heat treatment temperature exceeds 473K, the boundary strength gradually decreases with increasing temperature. Every specimen failes at boundary between matrix and composite parts in bending tests for measuring boundary strength.抄録全体を表示PDF形式でダウンロード (1369K) -
青柳 成俊, 河原 一郎, 中川 昌也, 小島 陽1993 年 43 巻 8 号 p. 410-415
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーThe feature of age hardening in the composite fabricated by pressure infltration technique was possible to explain with high dislocation density in the matrix resulting from the mismatch in the coefficient of thermal expansion between the matrix and the SiC whisker. Microstructure and high temperature strength of the composites under both as cast and T6 conditions were examined. High temperature strength of composites was superior to the matrix strength in all conditions. But, when the tensile tests were carried out at over 523K, the composite strength in as cast conditions and T6 conditions were about 500 and 330MPa, respectively.抄録全体を表示PDF形式でダウンロード (1346K) -
横田 仁志, 興戸 正純, 沖 猛雄1993 年 43 巻 8 号 p. 416-420
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーThe wettability of aluminum against SiC was evaluated by means of an interfacial impedance method. SiC was dipped into the molten aluminum or, SiC came into contact with aluminum by using centrifugal casting in Ar atmosphere. In this system equivalent circuit at the interface is considered from Cole-Cole plot as parallel circuit of resistance and capacitance. If the wettability is better at the interface, the capacitance of the electric equivalent circuit is comparatively larger. In this system, the impedance data R, whose value is a length of segment of the semicircle cut by real axis in the impedance diagram, also changes with the wettability.抄録全体を表示PDF形式でダウンロード (537K) -
小松 伸也, 池田 勝彦, 生駒 俊彦, 河野 洋一1993 年 43 巻 8 号 p. 421-426
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーDependence of resistivity of solid solution ρss on solute concentration and temperature of measurement was considered. In relatively dilute solid solution, ρss can be approximated by a linear function of solute concentration C. Deviation from Matthiessen's Rule (DMR) defined by change in dρ/dT with C can be replaced by temperature dependence of dρ/dC(≡Δρ), change in ρ with C. Using difference ε = ΔρT2-ΔρT1 and ratio η = ΔρT2/ΔρT1 of Δρ at two different temperatures T1 and T2 (T1<T2), following two relations between ρSST1 (resistivity of a (b, c) ternary solid solution at T1K) and resistance ratio R = ρT2/ρT1 are obtained.
ρSST1=(ρPURET2-ρPURET1+Cbεb+Ccεc)/(R-1)
ρSST1=[ρPURET2-ρPURET1ηb+CcΔρcT1(ηc-ηb)]/(R-ηb),
where ρPURE is ρ of idealy pure solvent metal. For solid solution of high concentration, replacing C to f (X), an appropriate function of atomic fraction X, and Δρ to Δρf(X) based on the f (X), similar expressions as above two relations can be obtained. The R-ρ relations in commercial magnesium alloy AZ91 were investigated comparing with those calculated from reported ρ values. The Δρ of Al in Mg is smaller at 300K than at 77K and DMR is negative, however, Zn in Mg appears to show a positive DMR. As an empirical R-ρ relation applicable to ρ changes resulted from aging and solution treatment of AZ91 alloy,
52<ρ77/nΩ•m= [69.1/(R-0.77)]-13.8<138 is recommended.抄録全体を表示PDF形式でダウンロード (655K) -
羽賀 俊雄, 本村 貢1993 年 43 巻 8 号 p. 427-432
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーThe nozzle-roll gap in the melt spinning is usually set closer than slit clearance of the nozzle, and puddle is held between nozzle and roll. At high roll speed and high ejection pressure of the melt, the puddle is broken and melt flows off (back break). We succeeded to make foil under the back break conditions setting nozzle-roll gap wider than slit clearance. The surface condition of the foil made with back break is more sound than the foil made by holding puddle. The diagram which consists of roll speed and ejection pressure is established in order to estimate the foil condition. The area in which sound foil can be made is compared between the diagram of back break and the diagram of puddle holding, and it has been found clear that the method of "high roll speed and high ejection pressure method" is suitable for making sound foil.抄録全体を表示PDF形式でダウンロード (721K) -
伊藤 勲, 乙黒 靖男, 上妻 勝也, 龍 宇嬰1993 年 43 巻 8 号 p. 433-437
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーEffects of single addition of Sn and combined addition of Sn and other element (Cu, Mg, Zn, Ti, Si, Bi, Cr, Mn or Ni) to aluminum on the diffusion weldability of steel and aluminum alloys in the atmosphere were investigated. Diffusion welding was mainly carried out at 873K for 3.6ks under pressure of 2MPa. After the welding, Fe2Al5 and FeAl3, whose total thickness range from about 30 to 100μm according to different alloying elements in aluminum, are produced in the diffusion layer. There is no correspondence between the fracture strength and the total thickness. The combined addition of Sn and Mg to aluminum produce the couple showing good weldability with the strength of about 50MPa, while the single addition of Sn shows the strength of only about 30MPa. All welding couples except Steel/Al-0.5Sn-1Cu, which fracture at initial welding interface, fracture at the position concentrated with Sn.抄録全体を表示PDF形式でダウンロード (805K) -
江田 浩之, 坂口 雅司, 前原 久, 鋤本 己信, 淵澤 定克1993 年 43 巻 8 号 p. 438-443
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーFree bulge formability of extruded or drawn tubes of aluminum alloy A6063 has been investigated with special references to the difference in the extrusion method (whether mandrel extrusion or porthole extrusion), and to the effect of annealing prior to drawing. The mandrel extruded tubes had better formability than the porthole extruded tubes in which both mechanical properties and concentration of {001} orientation are not uniform along the tube axis. The formability of drawn tubes without preliminary annealing was superior to those with annealing, because the former had more fine and uniform microstructure and more random crystallographic orientation than the latter.抄録全体を表示PDF形式でダウンロード (691K) -
伊藤 吾朗1993 年 43 巻 8 号 p. 444-446
発行日: 1993/08/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (355K)
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