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Volume 32, Issue 1
Displaying 1-9 of 9 articles from this issue
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Ichiro NAKAYAMA1982 Volume 32 Issue 1 Pages 1-2
Published: January 30, 1982
Released on J-STAGE: July 23, 2008
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Shigeo ZAIMA, Masaji IIO, Ying Chih HUANG, Kozo ARAI, Ichizo TSUKUDA1982 Volume 32 Issue 1 Pages 3-7
Published: January 30, 1982
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSThe cutting resistance, cutting temperature, cut surface roughness, tool wear, chip treating and others of free cutting aluminum alloys 2011-T3 and 2011-T8, a high strength alloy 2017-T4, 5056 alloys having different compositions and newly developed free cutting alloys G67-T6 and G67-T8 were examined. Those of a free cutting brass and a free cutting steel were also tested for comparison. 2011 alloys are excellent in machinabilities especially in the tool flank wear and the chip treating. G67 alloys have similar turning machinabilities as 2011. All the 5056 alloys have nearly the same turning machinabilities a little better than 2017 having poor machinabilities. Both the turning and drilling machinabilities show nearly the same tendencies.View full abstractDownload PDF (992K) -
Kenji HIGASHI, Tadakazu OHNISHI, Kenji KOMATSU, Yoshizo NAKATANI1982 Volume 32 Issue 1 Pages 8-13
Published: January 30, 1982
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSThe temperature dependence of fracture toughness of 5083-O and 5083-T were estimated by measuring the critical crack tip opening displacement (CTODc) derived from stretched zone analysis. These alloys have an excellent property in a static tensile test and show appreciable low temperature embrittlement in a dynamictest. CTODc significantly depends on temperature. The CTODc values of 5083-O at room temperature and -196°C are 70 and 21μm respectively and those of 5083-T 50 and 18μm respectively A proportional relation is found between the stretched zone width and stretched zone height. The crack tip plastic blunting is about 68°. A laminated fracture is observed in a low temperature range and is enhanced by an aging treatment. An occurance of laminated fracture is attributed to a triaxial constraint at a crack tip and to a laminated distribution of undissolved particles and precipitates.View full abstractDownload PDF (1482K) -
Hajime YAMADA, Takio TANAKA1982 Volume 32 Issue 1 Pages 14-19
Published: January 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSEffects of additions of yttrium 0.04 to 0.2% and a commercially available unseparated mixture of yttrium group on the recrystallization temperature of Al-Zr alloys containing 0.1 to 0.3%Zr were examined. Minor additions of yttrium and mixture of yttrium group to the Al-Zr alloys have a considerable effect to elevate the recrystallization temperature. The effect is intensified by precipitation treatment. It is the most remarkable in the Al-Zr alloy containing about 0.2%Zr, but is not so remarkable in the dilute alloys such as Al-0.1%Zr alloy. Such an effect of yttrium and its group is explained by an enhancement of precipitation of finely dispersed Al3Zr particles during the precipitation treatment of Al-Zr supersaturated solid solution.View full abstractDownload PDF (725K) -
Mineo GONDA, Masafumi MIZOUCHI, Mitsuru ADACHI1982 Volume 32 Issue 1 Pages 20-25
Published: January 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe electrical conductivity of hyper-eutectic Al-Si alloys into which various combinations of P and Ca had been added to control the primary Si size was measured by means of an eddy current method. The electrical conductivity of the alloys is directly proportional to the primary Si size. The electrical conductivity measurement is applicable as a rapid routine test to estimate refinement of the primary Si size. The change in electrical conductivity is attributed to the local changes of magnetic flux density due to difference in the primary Si size on the bases of differential thermal analyses and lattice constant measurements.View full abstractDownload PDF (949K) -
Hisashi SUZUKI, Motohiro KANNO, Osamu KANOH1982 Volume 32 Issue 1 Pages 26-31
Published: January 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSTransmission electron microscopy was carried out on the Al-4%Cu alloy solution-treated at 793K for 7.2ks, quenched into iced water or directly quenched to an aging bath and subsequently aged for different times. Homogeneous precipitation of a θ' phase never occurs in any cases. The θ' structure actually observed is controlled by the θ' precipitates formed on dislocation loops, dislocation lines and/or θ". The θ' precipitates form on dislocation loops if specimens were water quenched or direct-quenched to comparatively low temperatures and aged; on considerably sparse dislocation lines if direct-quenched where neither loops nor θ" appear; and form on θ" if direct-quenched where loops never appear but θ" precipitates develope.View full abstractDownload PDF (2783K) -
Hisashi SUZUKI, Motohiro KANNO, Koji HAYASHI1982 Volume 32 Issue 1 Pages 32-45
Published: January 30, 1982
Released on J-STAGE: July 23, 2008
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Hiroshi FUJINUMA, Takayoshi YOSHIMORI1982 Volume 32 Issue 1 Pages 46-52
Published: January 30, 1982
Released on J-STAGE: July 23, 2008
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Satoru NAKATSUGAWA1982 Volume 32 Issue 1 Pages 53-62
Published: January 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (1268K)
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