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Volume 15 (1965)
- Issue 6 Pages 333-
- Issue 5 Pages 273-
- Issue 4 Pages 201-
- Issue 3 Pages 139-
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 15, Issue 5
Displaying 1-8 of 8 articles from this issue
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Kyoji SHIMIZU1965 Volume 15 Issue 5 Pages 273-274
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (412K) -
Takuichi MORINAGA, Tsuneo TAKAHASHI, Junichiro YAMASHITA, Genichi YOKO ...1965 Volume 15 Issue 5 Pages 275-279
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSA systematic study has been made for the aging characteristics of a wide ranged ternary Al-Zn-Mg alloys containing 4-6% Zn and 1-3% Mg. The ternary Al-Zn-Mg alloys have good mechanical properties in the age hardened condition and the resistance to stress corrosion were improved by adding a certain elements such as Cr and Mn. Effects of Zn, Mg, Cr and Mn on the age hardening mechanism by means of dilatometory and X-ray diffraction analyses were investigated.
The results abtained are summarized as follows:
1) The peak-hardness values decrease with the increase of aging temperature.
2) In the Z specimen in which Cr and Mn were added to basemetal, the beginning of age hardening delays.
3) In the A and B specimens the manimum-hardness values are obtained at about 250°C treatment.
4) The precipitate in specimen containg 4.74% Zn, 1.93% Mg has comporition MgZn2 of which is found to he dÅ=2.43.View full abstractDownload PDF (868K) -
Takuichi MORINAGA, Tsuneo TAKAHASHI, Junichiro YAMASHITA1965 Volume 15 Issue 5 Pages 280-286
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe welding characteristics of ternary Al-Zn-Mg alloys with Zn contents of 4-5% and Mg contents 1-3% have attracted person's attention. The present study has been made in order to explain various effects of Cr and Mn on the mechanism of aging and anti-corrosion properties of Al-Zn-Mg permanent mold casting alloys containing 4%Zn-2%Mg, 4%Zn-2%Mg-0.3%Cr and 4%Zn-2%Mg-0.3%Cr-0.5%Mn.
The result obtained are summarized as follows:
1) In the experiments of the (natural) aging at room temperature, hardness approximately becomes a stable state from about the 21st day after being cast. by addition of Cr and (Cr+Mn), the hardness is slightly improved compared with ordinary alloy.
Alloys-basemetal-Cr and basemetal-Cr-Mn become slightly harder than basemetal.
2) In the T5 treatment, 120°C treatment is more excellent than 100°C treatment.
3) In the T4 treatment, hardness increases from the 1st day to the 7th day after heat treated at 440°C as well as 530°C but shows a little increase since.
4) In the T6 treatment, the best result is gained by the solution treatment for 15hrs at 530°C and artificial aging for 24hrs at 120°C
5) In the test of anti-corrosion property, the specimens in which Cr and Mn were added to the basemetal have excellent effect.View full abstractDownload PDF (1179K) -
Influences of the point angle and the lip clearance of drill on the figure of counter-sinkShigeo ZAIMA, Akiyasu YUKI, Osamu HORIUCHI1965 Volume 15 Issue 5 Pages 287-292
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSContinuing the previous report, the influences of the point angle and the lip clearance of twist drill on the figure of counter-sink are examined in the case of six sorts of aluminium sheet, e. g. 2S-H, 3S-H, 14S-O, 52S-H, 61S-H and G4-H.
As the results, it turns out that the figure and the out of roundness of counter-sink are affected largely by the point angle and the lip clearance: that is, the smaller the point angle and the lip clearance respectively are, the more similar to circle the figure of counter-sink is, and the smaller the point angle and the lip clearance respectively are, the smaller the out of roundness of counter-sink is. In the case of the counter-sinking of the soft materials as like 2S-H, 3S-H or so, it must be used smaller point angle drill or smaller lip clearance drill to obtain the figure which is simillar to circle and has less out of roundness than in the case of the hard materials as like 52S-H, G4-H or so.
This study was conducted with funds furnished by Scholarship Committee of the Institute of Light Metal Foundation, for which we feel deeply grateful.View full abstractDownload PDF (829K) -
Study on Al-Si-Cr-Mg-Zn alloys (Part 1)Chiuyo HISATSUNE, Takeo SHINODA1965 Volume 15 Issue 5 Pages 293-298
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effect of zinc on the mechanical properties and microstructures of an Al-Si-Cr-Mg alloy, containing 8.5% silicon, 0.3% chromium and 1.0% magnesium, were studied.
Addition of 1.0-2.0% zinc improves remarkably the mechanical properties of these alloys.
In an alloy of Al-8.5% Si-0.3% Cr-1.0% Mg-1.0-2.0% Zn, after T6 treatment, various compounds are precipitated. These are T (Mg, Cr) compound, α (Cr, Si) compound, β(Cr, Si) compound and Mg2Si. The mechanical properties are improved by the precipitation of these compounds, and the tensile strength of this alloy, which was cast in sand mould and T6 treated, increases to 39-40.5kg/mm2 and elongation exceeds 1.5%.View full abstractDownload PDF (1197K) -
Structure of Aluminium-coated steel plateToshio YAMADA, Shigeo MARUNO, Katsuhisa SUGIMOTO1965 Volume 15 Issue 5 Pages 299-305
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSAs the electro-deposited zone by the electrophoretic method on the surface of the steel plate has the weak combining power and easily come off, it needs to be compacted and sintered in order to obtain compact Aluminium-zone which is combined firmly with the steel plate.
The compacted zone made using of flaky powder and atomized powder was compacted by the press machine under the room temperature, and sintered in the vacuum (10-2mmHg).
The electrolytic test, the x-ray diffraction and the metalloscopic observation were done for the purpose of examining the states of combination between the deposited zone and the steel plate.
Furthermore, in order to know how the structure hanges when it is heated for long hours in the atmosphere at the temperatures below the melting point of aluminium, after being heated for 5 hours at the temperatures of 500°C and 640°C, the metalloscope and the x-ray diffraction adapted to examine its structure.
The result:
1) In the case of flaky powder, the conditions of compacting and sintering were fit when the compacting pressure was 3.5ton/cm2 and the sintering time 60-90 minutes.
2) The deposited zone having been sintered for 60 minutes at the temperature of 600°C became clear what seemed to be the alloy zone by the electro-test, it could not be, however, determined to be the alloy-zone by the x-ray diffraction.
3) As for the deposited zone which had been sintered for 10 minutes at the temperature of 750°C, the compact alloy-zone was not observed in this case.
4) When the deposit was diffused by heating for 5hours at the temperatures of 500°C and 640°C after being sintered, in the former case the alloy-zone could not be observed clearly, in the latter case, however, the alloy-zone could be seen.
5) When it was kept for 5 hours at the temperature of 640°C after being sintered the deposit for 90 minutes in the temperature of 600°C, and then made alloy-zone was η-phase (Fe2Al5) from the result of x-ray diffraction, and same time leaving aluminium and iron oxides (FeO, Fe2O3 and Fe3O4) existi n the alloy-zone. Otherwise, in the case of aluminized steel most of the alloy-zone was θ-phase (FeAl3) and a little α3-phase (FeAl) also was recognized, however, leaving aluminium and iron oxides did not exist.View full abstractDownload PDF (1305K) -
Mamoru IMABAYASHI, Kohei TOMITA, Masahiro OUCHI, Harero IWAMURA1965 Volume 15 Issue 5 Pages 306-317
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSMany studies have been made on the relationships between light alloys and gases.
But few papers have been reported on gas analysis of light alloys, containing volatile constituents (i. e. Mg, Zn etc.). These constituents evaporate under vacuum condition, and cause the contamination of apparatus and readsorption of gases due to sublimation. Accordingly, it is difficult to obtain the reliable gas content in these alloys.
The authors solved this problem by using a thin capsule of aluminium or steel in which the sample was enveloped.
The procedure of this method are described in detail, and a few experimental results on magnesium, zinc, Mg-Zn alloy and Al-Mg alloy are also referred.View full abstractDownload PDF (1965K) -
Masaaki ABE, Masaakatu HARADA, Hajime YAMADA1965 Volume 15 Issue 5 Pages 318-324
Published: September 30, 1965
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIt is difficult to get an adequately accurate determination on the quantitative chemical analysis of small amounts of Be, B and Mg contained in aluminium because of the interference of these coexistent elements with them.
The authors, therefore, in this report studied on the spectrochemical determination for the three elements and also Ti by the powder method using a "pin to necked-electrodes" intermittent A.C. are source unit as the spectrum excitation for the purpose of reducing the time required for the analysis as well as improveing th eaccuracy.
The results were as follows:
1) The most favorable condition for the excitation was, current: 10A, intermittent ratio: 1/4×1/sec and exposure time: 10sec (5sec×2).
2) When IBe 2348.61Å/ICo 2407.25Å, IB2497.73Å/ICo 2424.93Å and IMg 2852.13Å/ICo 2629.93Å were used as the analytical line pair, an amount of 0.0005-0.048% Be, 0.004-0.080% B and 0.0005-0.040% Mg could be analysed respectively.
Whereas, when III Ti 3234.52Å/ICo 3254.12Å and III Ti 3349.41Å/ICo 3254.12Å were used, a Ti content ranging from 0.001-0.065% could be analysed.
3) The variation coefficient in this method were 3.4-13.3%, 5.4-14.3% and 4.3-15.4% in the case of Be, B and Mg respectively, and 5.1-8.0% in the case of Ti.
The accuracy obtained from this method was quite acceptable for an industrial application and besides the analysis time could be curtailed to about one-fifth of that required for the conventional chemical analysis.View full abstractDownload PDF (912K)
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