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Volume 36, Issue 9
Displaying 1-9 of 9 articles from this issue
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Hajime YAMADA1986 Volume 36 Issue 9 Pages 535-536
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
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Yoshio OSADA, Yasuo KOBAYASHI, Kyoji SATO, Toshio ISOBE1986 Volume 36 Issue 9 Pages 537-547
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSPrecipitates in typical aluminum casting alloys were identified by X-ray diffraction and electron probe microanalysis referring to colored optical micrographs. Colored optical micrographs ensure more accurate estimation of precipitates by observing their shape and color. Fine precipitates of ternary constituents in the bulk sample can be identified through electron probe quantitative microanalysis by comparing the weight ratio of two main constituents. The precipitates contain about 1% of each alloying element in the form of solid solution. Accurate analysis is achieved regardless of the influence of matrix by comparing analytical values between the precipitates extracted from the matrix and those at least 5μm in size in the bulk sample.View full abstractDownload PDF (5410K) -
Tadashi TAKEMOTO, Hideyuki NAKAMURA, Ikuo OKAMOTO1986 Volume 36 Issue 9 Pages 548-554
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA spread test on Ti-base metals and clearance filling test on Al/Ti joints were performed in relation to the composition of aluminum filler metals and surface area of getter materials. The spread area on Ti-base metals depends on the surface area of Ti in a brazing furnace due to an effective gettering action of Ti. Mg bearing brazing sheets are also effective getter materials. Al-10Si-Mg alloy is the most suitable filler metal for vacuum brazing of Al/Ti joints, and allows sound fillets at 600°C. Al-10 to 12.5Cu-5 to 8Sn and Al-20Ag-10Cu filler metals are also applicable at brazing temperatures 600° to 620°C. The joint strength is, however, only a half of that of Al-10Si-Mg filler metals.View full abstractDownload PDF (1400K) -
Toshiro KOBAYASHI, Mitsuo NIINOMI, Koichi IKEDA1986 Volume 36 Issue 9 Pages 555-561
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSP-L effect in high silicon aluminum alloys has been investigated along with the mechanical properties. Solution treatment increased elongation of these alloys, without decrease in strength. P-L effect in high silicon aluminum alloys was first found in this study. This P-L effect is of A type and considered to be caused by the interaction between solute atoms of silicon and dislocations. The activation energies for the P-L effect were determined to be 35.5-92.5kJ/mol. These values are in agreement with those reported in other aluminum alloys. Values of (m+β) were determined to be 2-3, where m and β are the strain exponents of vacancy concentration and mobile dislocation density, respectively. These values are near those obtained in other fcc metals. β is less than 1, and m is larger than β, suggesting that vacancy concentration could govern the P-L effect.View full abstractDownload PDF (729K) -
Hiroshi ANADA, Katuyuki FUNAKI, Yasuharu NAKASHIMA, Hisanao SAWABU, Sh ...1986 Volume 36 Issue 9 Pages 562-570
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe solidifying conditions for formation of feathery crystal in Al-Mg alloys were investigated by using unidirectional solidification and the new solidifying method "Graphite-Mold Submerging (GMS) process". This was able to control solidifying rate R and temperature gradient G respectively and its prominent feature was to submerge melt-filled mold heated at casting temperature into water bath directly. In the R-G diagram, the formation zone of feathery crystal in each composition of Al-Mg alloys was enclosed with suitable R and G respectively and its zone was shown as triangles between columnar and granular crystal zone. In view of relationship between G/R and R on the formation zone of each crystal structure, the feathery crystal zone overlapped columnar's and decreased continuously with increaing R. Therefore it is considered that feathery crystal is the peculiar structure belonging to columnar crystal.View full abstractDownload PDF (1545K) -
Junichi ENDOW, Tadao MUROTA1986 Volume 36 Issue 9 Pages 571-576
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDeformation in uniform bending of aluminium-fin-tube with slit is experimentally studied. Aluminum-fin-tubes with pararell type slit and cross type slit with different slit distances are bent in such a situation that the plane of the fin coincides with the bending plane. Following conclusions are obtained. 1) There exists a slit distance Leim under which value, the fin does not affect the deformation of the tube in bending. 2) The deformation of the fin-tube in bending concentrates at the slit bottom except the case when slit distance is lower than Leim In this case, the bending deformation is uniform along the tube axis direction. 3) Twisted fin has no effects on the bending deformation of the fin-tube when slit distance is lower than Leim. 4) If there exist some uncutted width f* between the slit bottom of the fin and the tube, the bending deformation of the fin-tube is nearly the same of the fin-tube which has the slitless fin of the fin width f=f*.View full abstractDownload PDF (620K) -
Yasushi IWATA, Yoshiaki YAMAMOTO, Motoshi NAKAMURA, Haruo SUZUKI, Hiro ...1986 Volume 36 Issue 9 Pages 577-581
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe flowout behavior of molten metal (ADC12) through many gates of a die casting runner has been examined. The flowout behavior of water through the gates was similar to that of molten metal. Flowout volume through the lower runner gates was greater than the volume through the upper runner ones, and bubbles appeared in the runner when the unpressurised system (main runner/sub runner=1:1.6) was used. Flowout volumes through the gates were equal to one another when the pressurised system (main runner/sub runner=1:0.8) was used and the ratio (gates area/runner area) was reduced to 0.3. Filling-up time was shortened by using the pressurised system and reducing the ratio (gate area/runner area) to 0.5. The bubbles, which appeared in the runner with the unpressurised system, were not observed in the one with a pressurised system.View full abstractDownload PDF (543K) -
Kozo OSAMURA1986 Volume 36 Issue 9 Pages 582-593
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
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Shigeyasu KODA1986 Volume 36 Issue 9 Pages 594-606
Published: September 30, 1986
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (2974K)
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