| Effect of Ti Addition on Corrosion Resistance of Al-Mn-Mg-Si-Cu Alloys |
APR 90 |
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| Authors:
Y. Shoji; S. Yamauchi
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 | The effect of Ti, Cr, and Zr additions on the corrosion resistance of Al-1.1Mn-1.0Mg-0.6Si-0.5Cu alloys for automotive heat exchangers was studied by the accelerated corrosion tests of SWAAT, cyclic alternate immersion, CASS, and AASS. Addition of 0.16Ti reduced the maximum corrosion depth nearly by half, and changed the corrosion morphology from pitting accompanied by intergranular corrosion to lameller corrosion. On the other hand, addition of Cr and Zr did not ... |
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| Development of a Rapidly Solidified Al-Fe-Si-Cu-Mg Alloy |
APR 90 |
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| Authors:
Y. Ohkubo; K. Shibue; H. Mizukoshi; S. Yamauchi; S. Inumaru
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| A new Al-8Fe-2V-1Zr-2Cu-1Mg-3Si alloy (PA107) has been developed for elevated temperature applications by means of rapid solidification and powder metallurgy processing. It contains a large volume fraction of fine globular dispersoids which are determined as the cubic-AlFeSi phase (Al(sub 20)Fe(sub 5) Si(sub 2)). The alloy has high fatigue and tensile strengths at room and elevated temperatures, due to the effect of solid solution hardening of Cu and Mg. Furthermore the ... |
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| Effect of Extrusion Conditions on Extrudability of Al-Si P/M Alloy |
JAN 89 |
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| Authors:
H. Sano; M. Abo; S. Yamauchi
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| Al-20Si-2Cu-1Mg-5Fe-1Mn (wt%) alloy made by rapid solidification was extruded by indirect hot extrusion at temperatures of 350 to 500 C and at strain rates of 0.05 to 5/s, and then its flow stress and formability during extrusion were investigated in comparison with the I/M alloy of the same composition and 4032 alloy. Flow stress of the P/M alloy decreased with extrusion temperature and increased with strain rate the same as ... |
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| Effects of Si Content on the Properties of P/M Al-Si Binary Alloys, |
OCT 1985 |
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| Authors:
H. Sano; K. Shibue; S. Yamauchi; S. Inumaru
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| Recently, P/M Al-Si alloys have been being developed for wear resistant applications by rapid solidification processing. However, the systematic studies on effects of Si content have hardly been known. In the present work, effects of Si content on the properties of the extruded P/M Al-Si binary alloys have been investigated in comparison with I/M alloys. Yield strength and tensile strength increased with the Si content. It was considered that strengthening ... |
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| The Effect of the Cooling Rate on the Solidification Structure of Al-4. 5%Cu Alloy Powders |
APR 84 |
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| Authors:
K. Shibue; S. Yamauchi; S. Inumaru
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| From the solidification structure, dendrite arm spacing was measured to estimate the cooling rate. The particle size distributions were dependent on the kind of atomization gas at the same gas pressure. And the average size was 58 microns, 88 microns and 78 microns for the helium, argon and nitrogen gas, respectively. The powders produced by the helium gas atomization were solidified more rapidly than those by the argon and nitrogen ... |
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| Crevice Corrosion of Titanium Tubes in MSF Desalination Plants |
OCT 80 |
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| Authors:
S. Yamauchi; K. Nagata; S. Sato
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| Crevice corrosion of titanium tubes in roller-expanding joints has been investigated in connection with the influence of various factors such as NaCl concentration, temperature, pH, surface condition, expanding ratio, tube sheet material, and coupling with metallic copper. It was found that commercially pure titanium tube can suffer crevice corrosion in 4 to 6% NaCl solutions at the temperatures higher than 60 C, while Ti-0.15Pd alloy tube is free from corrosion ... |
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| Hydrogen Absorption of Titanium Heat Exchanger Tubes in MSF Desalination Plants |
80 |
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| Authors:
S. Sato; K. Nagata; S. Yamauchi; SUMITOMO LIGHT METAL INDUSTRIES LTD TOKYO (JAPAN)*
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| Hydrogen absorption of titanium tube occurred remarkably at the temperature above 100 C in the solution containing 0.01-1M Fe(OH)(Sub 2) precipitates. Hydrogen absorption was accelerated by coupling with steel, by iron contamination on titanium surface and by roller-expansion. On the other hand, it was suppressed almost perfectly by acid pickling of titanium. Ti-0.15Pd alloy tube was much more likely to suffer hydrogen absorption than c.p. titanium. Results suggested the possibility ... |
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| THERMODYNAMIC PROPERTIES OF TERNARY REFRACTORY CARBIDES. III. ZIRCONIUM-HAFNIUM-CARBON. |
DEC 1969 |
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| Authors:
M. Hoch; S. Yamauchi; CINCINNATI UNIV OHIO
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| The thermodynamic properties of ternary zirconium-hafnium carbide, Zr(x)Hf(1-x)C(y), having the sodium-chloride type structure were studied, using the time-of-flight mass spectrometer. The ratios of the activities of the components were measured as a function of composition at 2440K. From the variation of the ratio of activities with composition, the pairwise interaction energies were obtained. The metal-metal interaction energy (E(12)-(E(11)+E(22))/2) = 1.9 plus or minus 0.3 kcal/mole, similar to that in the ... |
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| THERMODYNAMIC PROPERTIES OF TERNARY REFRACTORY CARBIDES. IV. RELATIONS BETWEEN THERMODYNAMIC PROPERTIES, BONDING, AND COMPRESSIBILITY. |
DEC 1969 |
22 pages |
| Authors:
M. Hoch; S. Yamauchi; CINCINNATI UNIV OHIO
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 | The high temperature thermodynamic data obtained on ternary carbides having the sodium-chloride type structure have been correlated with the bonding and mechanical properties of these carbides. The metal-metal bonding on the metal sublattice in the carbide is the same as in the binary body-centered cubic metals. The variation of the carbon-carbon interaction energy and the metal-carbon interaction energy indicates that the metal-carbon bonds are localized bonds. From the variation of ... |
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