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Volume 32, Issue 11
Displaying 1-8 of 8 articles from this issue
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Tadashi HIROKANE1982 Volume 32 Issue 11 Pages 569-570
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
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Kozo ARAI, Ryotatsu OTSUKA, Sigemi TANIMOTO, Ichizo TSUKUDA1982 Volume 32 Issue 11 Pages 571-576
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSInfluences of such additional elements as 0.2% of Mn and Cr on the quench sensitivity of Al-0.8wt%Mg-0.7wt%Si-0.7wt%Cu alloy were studied by making the homogenizing time-homogenizing temperature-precipitates curve (TTP curve) and by electron microscopy. The mechanism of quench sensivity was discussed. The quench sensitivity of Al-Mg-Si alloy is intensified to greater degree by the addition of Cr than by that of Mn. The quench sensitivity is also intensified as the homogenizing temperature lowers in the range from 500° to 600°C. The effect of Mn and Cr on the quench sensitivity is reasonably explained in terms of an increase of microscopic insoluble compounds which act as preferential nucleating sites for precipitation of Mg2Si.View full abstractDownload PDF (1414K) -
Hisashi SUZUKI, Motohiro KANNO, Nobuo HAYASHI1982 Volume 32 Issue 11 Pages 577-581
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe precipitation of T1 (Al2CuLi) phase was investigated with special attention to the nucleation site for an Al-4.2%Cu-1.3%Li alloy by means of transmission electron microscopy. The T1 phase is nucleated at fine secondary defects which have formed densely in an early stage of aging, resulting in the uniform distribution of T1 when specimens are water-quenched and aged. The distribution becomes extremely sparse when such specimens as step-quenched or direct-quenched to decrease the vacancy concentration are aged. It is suggested that T1 phase is formed independent of G.P. zones.View full abstractDownload PDF (1462K) -
Makoto SUGAMATA, Jun-ichi KANEKO1982 Volume 32 Issue 11 Pages 582-588
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe effect of thermomechanical processing on age-hardening and mechanical properties of 7N01 alloy was studied. The amount of age-hardening is decreased by prior plastic working. The thermomechanically processed material has the strength higher than that in the T6 temper only when work-hardening exceeds the resulting decrement of age-hardening. Precipitation of η' is promoted by prior plastic working, but The age-hardening is suppressed due to formation of coarse η' precipitates on dislocations. The tensile elongation and reduction of area of the thermomechanically processed alloy decrease with an increase of tensile strength. rate of decrease in tensile ductility is higher at room temperature than at -196°C. The dynamic fracture toughness also lowers with an increase in tensile strength by thermomechanical processing. It is lower in the LT direction than in the L direction in the thermomechanically processed mateial.View full abstractDownload PDF (1861K) -
Yoshio HASEGAWA, Shinsaku HANASAKI, Shigeki OKUYAMA, Ji-Bok SON, Mitsu ...1982 Volume 32 Issue 11 Pages 589-595
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe effcet of grinding condition on grinding characteristics of commercial pure aluminum was studied in wet cylindrical plunge cut grinding. (I) In grinding with water solution type grinding fluid: The heaviness of grinding condition does not affect on the loading area ratio. The coarse loaded chip and the loading area decrease at the higher peripheral speed of grinding. Under such a condition that causes coarse loaded chip and under heavy grinding, the grinding wheel wears considerably, the surface roughness coarsens and a grinding force decays largely. (II) Effects of grinding fluids: There hardly occurs the coarse loaded chip with grinding oil. Concerning with surface roughness and surface polish, a high viscous grinding oil is recommeded. The grinding wheel wears less with grinding oils than with water solutions and water soluble grinding fluids.View full abstractDownload PDF (1610K) -
Shigenori HORI, Hideo TAI, Yukio NARITA1982 Volume 32 Issue 11 Pages 596-603
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSMicrostructures of aluminum containing titanium up to 3.3% solidified at various cooling rates from 10-i to 107°C/s were examined. The microstructures of these alloys are classified into three types in accordance with the cooling rate and titanium content; i) aluminum enforced solid solution, ii) aluminum solid solution + equilibrium Al3Ti, and iii) aluminum solid solution + metastable Al3Ti. The grain size of aluminum alloys is responsible to the titanium content and appearance of the metastable petal-like structure. The mechanism of the grain refining effect in these alloys is discussed.View full abstractDownload PDF (2416K) -
Hisashi NISHIMURA, Chozo FUJIKURA1982 Volume 32 Issue 11 Pages 604-621
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
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Osamu IWAO, Yoshiki HASHIZUME1982 Volume 32 Issue 11 Pages 622-631
Published: November 30, 1982
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (1819K)
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