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Volume 27, Issue 11
Displaying 1-8 of 8 articles from this issue
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Hisashi SUZUKI, Motohiro KANNO, Shigeharu SAKANO1977 Volume 27 Issue 11 Pages 525-533
Published: November 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe influence of cold working at -196 to 0°C on the aging behaviors of the Al-4% Cu-0.065%Sn alloy was studied at aging temperatures of 0 to 100°C comparing with that of the Al-4%Cu alloy. The alloys were solution-treated at 520°C, quenched, elongated up to 15% and subsequently aged. If both the alloys are wrought at -30 to 0°C or aged at 50 to 100°C, the effects of cold working are difficult to discuss precisely. The reasons are: i) the alloys are aged during working, ii) the reversion of G. P. zones and annealing out of lattice defects considerably occur at the initial stage of aging, and iii) lattice defects, in particular, vacancies are also considerably annealed out. When the alloys are wrought at -196°C and aged at 0°C, the initial rate of aging is enhanced in the ternary alloy, but is retarded in the binary alloy with increase in working ratio. The G. P. zones become finer and denser in both alloys as the working ratio is increased.View full abstractDownload PDF (3026K) -
Hisashi SUZUKI, Motohiro KANNO, Shigeharu SAKANO1977 Volume 27 Issue 11 Pages 534-540
Published: November 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSAging phenomena at 175 and 200°C in the Al-4%Cu-0.065%Sn ternary alloy plastically deformed at -196°C were studied comparing with those of the Al-4%Cu binary alloy. Precipitation and age-hardening at those temperatures are markedly enhanced in the binary alloy by cold working as predicted from the previous works. Aging phenomena at 200°C in the ternary alloy are unsusceptible to cold working, because the distribution density of Sn-rich phases (formed at the early stage of aging) to act as precipitation sites of θ' phases almost unchanges. The phenomena at 175°C are somewhat complicated probably relating to the characteristics of θ" precipitation and θ" to θ' transformation.View full abstractDownload PDF (2517K) -
Hajime YAMADA, Takio TANAKA1977 Volume 27 Issue 11 Pages 541-547
Published: November 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSWhen aluminum casting alloys contain both of Cu 1% and Mg 0.5%, the finished surface in turning is considerably improved accompanying a little effect on the tool wear and cutting force. The finished surfaces of Al-5%Cu, Al-5%Si-3%Cu and Al-10%Si-3%Cu alloys are effectively improved by adding Mg approximately 0.3 or 0.5%. The compositive effect of Cu and Mg on the finished surface is attributed to remarkable increase of the hardness of matrix. Increase in the hardness of matrix up to about Hv 80 is effective to improve the finished surfaces of Al-5%Cu and Al-5%Si-3%Cu alloys, because the shear angle is remarkably increased with increase in the matrix hardness.View full abstractDownload PDF (1277K) -
Shigeo ZAIMA, Yasuhide KATO, Akio OSUGA1977 Volume 27 Issue 11 Pages 548-554
Published: November 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSOrthogonal cutting tests on 1100-O aluminum plates were made using negative rake angle tools. The distribution of the residual plastic strain on cut surfaces are measured by Moiré method. The tensile strain remains in the cutting direction and is emphasized in accordance with the cutting resistance. If a double rake tool having a negative rake angle is used and the 1st rake height is small enough against the depth of cut, cutting resistances and residual strains in the cutting direction are not so changed regardless of the 1st rake angle because of built-up edges. If the tool having large 1st rake height, the residual strains in the cutting direction and the cutting resistances are so large as in cutting using a negative and single rake tool. Requirements for using these tools are also described.View full abstractDownload PDF (1310K) -
Kazuo TERAZAWA, Akira IDA1977 Volume 27 Issue 11 Pages 555-559
Published: November 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSTension tests were carried out on two shapes of tensile specimens of A2024-T3, A7N01-T4 and A7075-T6 sheets. A-fractured elongation is generally greater than B-fractured one. Elongation evaaluted is greater than one not evaluated particularly when fracture occurs near the gage mark. Mean elongation B-fractured and evaluated is nearly equal to mean one A-fractured. This fact shows suitability of the JIS evaluation method. Even if B-fracture occurs, when the elongation not evaluated is superior to the elongation specified in the JIS, the JIS evaluation method for elongation is unnecessary in an industrial tension test.View full abstractDownload PDF (548K) -
Tadashi MOMONO, Katsuya IKAWA1977 Volume 27 Issue 11 Pages 560-566
Published: November 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe measurements of flow rate were made on a mercury pool stirred inductively by electromagnetic force for simulating the flow rate of molten aluminum. A linear relationship n = 3.59VAl + 7.22 is found between the average number of grains n and the flow rate VAl in the Al-3%Cu alloy. The variation of deflection angle of columnar crystals with flow rate were also experimentally determined. A slight convection flow inhibits inverse and gravity segregations, but vigorous stirring results in negative and positive segregations. These phenomena are explainable on the basis of the segregation behaviors during solidification with fluid flow.View full abstractDownload PDF (1125K) -
Masao MIZUNO1977 Volume 27 Issue 11 Pages 567-575
Published: November 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (1557K) -
1977 Volume 27 Issue 11 Pages ii
Published: 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (79K)
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