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Volume 32, Issue 2
Displaying 1-11 of 11 articles from this issue
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Toyoji Ushioda1982Volume 32Issue 2 Pages 63-64
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
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Hajime KATO, Tatsumi TOZAWA1982Volume 32Issue 2 Pages 65-69
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSTension tests of 2024 aluminum alloys solution treated at 500°C for 8hr, quenched and subsequently aged at room temperature in the range of aging time from 10 to 104min were carried out at the cross head speed 1mm/min. Average AE voltage-strain curves show the 1st peak at the strain near 0.2% proof stress and the 2nd peak in the strain region about 5 to 10%. The 1st peak voltage lowers as the aging time is prolonged. The 2nd peak is nearly constant regardless of aging time. A sensor of 450kHz frequency indicates lower values of the 1st peak than that of 140kHz, but these two sensors indicate nearly the same values of the 2nd peak. The change of rate count during plastic deformation well corresponds to that of average voltage. The total AE count decreases as the aging time is prolonged.View full abstractDownload PDF (798K) -
Shiro SATO, Hidetoshi KOBAYASHI, Hiromu HAYASHI, Hiromitsu ISHIKAWA1982Volume 32Issue 2 Pages 70-75
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSTension tests were carried out using two testing machines, screw-gear type machine (Shimazu Autograph IS-10T) and oil-hydraulic type machine (Shimazu Universal Testing Machine RH10). The proof stress is unsusceptible to the loading rate measured by the use of a screw-gear type machine, but is lowered with the accelerated loading rate by the use of a hydraulic machine because of the time lag for load indication. The tensile strength and elongation of soft materials such as 1050-H14 and 1230-H18 slightly increase with the accelerated loading rate. The tensile strength of such alloys as 2024-T3, 5052-H34 and 5083-O that show serrations decreases with the accelerated loading rate. The strain rate should be in the range from 20 to 80%/min for tension test of aluminum alloys.View full abstractDownload PDF (671K) -
Yuichi YAMASHITA, Susumu IKENO, Hiroshi ANADA, Shizuo TADA, Shigeo MUR ...1982Volume 32Issue 2 Pages 76-81
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSCasting factors in horizontal intermittent continuous casting of commercial pure aluminum such as drawing speed and draw-and-stop cycle were examined. A prolonged cycle of draw-and-stop is required with increases in pitch-length and drawing speed. The casting rate is accelerated with an increase in pitch-length up to 40mm and keeps constant at pitch-length above 40mm. Solidification proceeds both in stopping and drawing periods. Coarse columnar grains in the strip cast at 10mm of a pitch incline toward the reverse direction of casting. The strip cast at 80mm of a pitch has coarse columnar grains which incline toward the reverse direction of casting and needle-like columnar grains periodically.View full abstractDownload PDF (1178K) -
Masatoshi YANASE, Shoichi EGAWA, Masatoshi TSUDA1982Volume 32Issue 2 Pages 82-87
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDry wear tests of Al-Sn binary alloys containing 30 and 40%Sn were performed by rubbing the alloys against carbon steel on a pin-ring wear testing machine. Three different mechanisms, abrasive, oxidizing and melting wear function in wear of the Al-Sn alloys. The oxidizing wear of the alloys results in forming the oxidized layer on the sliding surface and in the minimum wear rate. The sliding surface of the alloys worn in the abrasive and melting wear mechanisms is considerably hardened, but that worn in the oxidizing mechanism is softened. The eutectic structure in the sliding surface layer in the alloys is strongly squeezed. The iron containing layer is formed on the sliding surface of the Al-Sn alloys by abrasive wear. If the melting wear occurs, considerable amounts of Al-Sn alloy adhere to the sliding surface of carbon steel.View full abstractDownload PDF (1720K) -
Hisashi SUZUKI, Motohiro KANNO, Nobuo HAYASHI1982Volume 32Issue 2 Pages 88-94
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAging behavior of Al-4%Cu-1%Li ternary and Al-4%Cu-1%Li-0.1%Cd quarternary alloys was investigated by means of hardness measurements and transmission electron microscopy. Specimens were normally aged (after water-quenching) or directly aged at 200°250°C for various times. T1' and TB' phases are commonly formed in both alloys, when they are aged at 200°250°C. The precipitation of T1' takes place homogeneously with the aid of excess vacancies, and that of TB' heterogeneously on several kinds of precipitation sites. The distribution of TB' in the quartery alloy becomes finer and denser independently of normal or direct-aging resulting in the increase in age-hardenability. The reason is in the fact that cadmium-rich precipitates are formed numerously at a very early stage of aging, and then TB' is formed on those cadmium-rich precipitates.View full abstractDownload PDF (2447K) -
Mototsugu KATSUTA, Shiro KOHARA, Kenichiro AOKI1982Volume 32Issue 2 Pages 95-99
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe forming limit curves of 1100-O and -H24 aluminum sheets were determined. Effects of strain path and of sheet thickness on the curve for 1100-O aluminum sheet were investigated. Two types of strain paths were employed. Strain path I; equibiaxial straining followed by uniaxial straining, and strain path II; uniaxial straining followed by biaxial straining. The strain path I increases the limit strain in the range of the plane strain deformation compared with the monotonic straining, when the deformation in the first stage is small. The strain path II increases the limit strain more than the monotonic straining in the range of stretch-forming. The forming limit increases with the thickness of sheet.View full abstractDownload PDF (818K) -
Masahiro SEIDO, Sadahiko MITSUGI1982Volume 32Issue 2 Pages 100-106
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
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Tosio ISOBE, Sanji KITAOKA1982Volume 32Issue 2 Pages 107-114
Published: February 28, 1982
Released on J-STAGE: July 23, 2008
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1982Volume 32Issue 2 Pages e1a
Published: 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (277K) -
1982Volume 32Issue 2 Pages e1b
Published: 1982
Released on J-STAGE: July 23, 2008
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