All issues
Volume 27, Issue 9
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
Noboru MASUKO1977 Volume 27 Issue 9 Pages 415-416
Published: September 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (206K) -
Masao KIKUCHI, Koji HORII, Masao MIZUNO1977 Volume 27 Issue 9 Pages 417-422
Published: September 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAging characteristics of Al-4.5%Zn-1.2%Mg, Al-3%Zn-3%Mg, and Al-2%Zn-4%Mg alloys weld metals were examined by means of hardness measurements, X-ray small angle scattering methods, and transmission electron microscopy. Hardness of weld metal in as welded state is higher for the Al-Zn-Mg alloys of higher contents of Mg. Hardness and volume-fraction of G. P. zones increases with increasing content of Zn in the Al-Zn-Mg alloy weld metals aged at room temperature or at 40°C. On the other hand, hardness is higher for the Al-Zn-Mg alloy weld metals of higher contents of Mg aged at 135°C. Effect of cooling rate on aging characteristics of Al-Zn-Mg alloy weld metal is more considerable for Al-3%Zn-3%Mg and Al-2%Zn-4%Mg alloys than for Al-4.5%Zn-1.2%Mg alloy.View full abstractDownload PDF (2434K) -
Mototaro SATO, Yoshio KATO, Kazuhiro TUTIYA1977 Volume 27 Issue 9 Pages 423-427
Published: September 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe relation between the X-ray intensity of rolling textures and anisotropic intensity was for 5052 sheets. The tensile test was also made on the specimens cut off at various inclinations to the rolling direction. The necking angle and the shear stress were analyzed on the basis of Hill's theory. A linear relation lies between the rolling reduction and the X-ray intensity of the preferred orientation in the rolling textures. The anisotropic intensity can be qualititatively explained to some extent from the (111) pole figure. The necking angle β in the tensile test changes with the angle to the rolling direction and takes either the maximum or minimum values at θ=45° with accordance to the change in rolling direction. The shear stress changes in the reverse phase of the β-θ curve. Hill's theory is substantially applicable to analysing the necking angle but not to analysing the shear stress.View full abstractDownload PDF (614K) -
Satoshi KAWAI, Ikuo ISHIGURO, Hiroshi YOSHIMOTO1977 Volume 27 Issue 9 Pages 428-435
Published: September 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSFe, Co, Ni, Co-Ni, Fe-Ni, and Fe-Co were electrodeposited into micropores in oxide films on aluminum produced in a sulfuric acid bath. The coercive force varies from about 0.6K Oe of Ni to about 3.2K Oe of Fe-Co (Co 40%) alloy. Excellent squareness ratios are observed in every deposits except Co and Co rich alloys. The recording density is calculated to be approximately 14K BPI in Fe-Ni (Ni 20%) alloy at about 3 μm in thickness. The vertical anisotropy leads to better results.View full abstractDownload PDF (1385K) -
Yoshiaki YAMAMOTO, Koji YONEKURA, Hiroaki IWAHORI, Motoyuki NAKAMURA1977 Volume 27 Issue 9 Pages 436-441
Published: September 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe relationship between the gas volume evolved from the cores furan resin bonded and phenolic resin bonded, and the gas pressure in a shell mold core during casting was investigated under the condition of equal gas volume evolution. Gas pressures at various portions of cores during casting an Al-7%Si-0.3%Mg alloy at 750°C was measured with a semiconductor pressure gauge newly developed. Shell mold cores 100mm in width, 150mm in length and 10, 15 and 20mm in thickness with a core print on its open side for degassing were used. The gas pressure is not in uniform distribution in a core and increases with the distance from the core print. The gas volumes evolved from both cores increase with increase in the amounts of resins. The gas pressure evolved from the furan coated sands is higher than that from the phenolic resin coated ones even under the condition of the same evolved gas volume. The difference in the gas pressure between two cores will be attributed to the difference in their initial gas evolution rate due to different decomposing temperatures rather than the evolved gas volume or the resin content.View full abstractDownload PDF (1235K) -
Kenjiro GOTO, Yoshihiko SHIMIZU, Goro ITO1977 Volume 27 Issue 9 Pages 442-449
Published: September 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSVarious metallurgical factors governing initiation of pitting corrosion were examined by electron microscopy, EPMA, and cathodic polarization measurements. Pits nucleate in the adjacent site of precipitates containing iron and/or silicon. Pits are prone to initiate on the cutting edge rather than on rolled surface of aluminium plate. Scratching has the most remarkable effect on initiation of pitting corrosion. The difference in susceptibility to pitting corrosion between the edge and the rolled surface of aluminum plate is attributed to the scratching effect on the edge surface.View full abstractDownload PDF (2871K) -
Toshiharu BABA1977 Volume 27 Issue 9 Pages 450-461
Published: September 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (2549K)
- |<
- <
- 1
- >
- >|