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Volume 14 (1964)
- Issue 6 Pages 361-
- Issue 5 Pages 289-
- Issue 4 Pages 223-
- Issue 3 Pages 141-
- Issue 2 Pages 73-
- Issue 1 Pages 1-
Volume 14, Issue 3
Displaying 1-10 of 10 articles from this issue
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Yoshio ANDO1964 Volume 14 Issue 3 Pages 141-142
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (313K) -
Kanehiro KIMOTUKI1964 Volume 14 Issue 3 Pages 143-153
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis report relates to the heating effect on the mechanical properties and on "retrogression" of alclad 2024-T3, T4, as well as 6061-T6 Al-alloys which are indispensable, materials for aircraft construction.
Summerized results are as follows:
1) Aged 2024-alclad alloy revealed clearly retrogression and temper hardening, but showed no secondary age hardening on heating.
2) Degree of retrogression can not reach to the equal value of tensile strength with that of solution heat treatment, but showed less tensile strength of 3 to 4kg/mm2 of T3 and T4 condition.
3) With 6061-T6 alloy, retrogression did not take place. But with heating up above to the artificial aging temperature, strength decreases with increase of heating time.View full abstractDownload PDF (981K) -
Relation between the condition of extrusion followed by solution heat treatment and abnormal grain growth of extruded productsShiro TERAI, Yoshio BABA1964 Volume 14 Issue 3 Pages 154-163
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSExperiments were carried out to study the manufacturing condition of extruded products of Al-0.45% Mg-0.38% Si alloy, with which their mechanical properties and electrical conductivity should meet the requirements of the 2EC standard (Tensile strength_??_20.3kg/mm2. Electrical conductivity_??_55% IACS), also with the least occurrence of grain growth.
The findings are summed up as follows:
(i) An abnormal grain growth is not observed in as extruded state of Al-0.45% Mg-0.38% Si alloy which was extruded at the temperature of 410 to 530°C with the reduction of 87 to 98%.
(ii) Solution heat treatment at or less than 480°C showed no abnormal grain growth of the above mentinned extruded products, but a large amount of grain growth due to secondary recrystallization was observed around the surface of extruded products after the solution heat treatment at higher temperature.
(iii) Extruded products of this alloy has about 22kg/mm2 in tensile strength and 56% IACS in electrical conductivity after solution heat treatment at 480°C followed by the precipitaition at 175°C for 20hrs.
(iv) Therefore, to meet with the requirement of the 2EC standard also to prevent an abnormal grain growth, solution heat treatment at 480°C is recommended for Al-Mg-Si alloy electric conductor.View full abstractDownload PDF (2563K) -
Study on Al-Pb alloysTamotu IGARASHI1964 Volume 14 Issue 3 Pages 164-171
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis is a report on the annealing of cold-rolled high-purity Al-Pb alloys. By measuring the breadth of X-ray rocking curve which was diffracted from a poly-crystal, the anther observed the dislocation movement in softening, recovery and recrystallization of Al-Pb alloys. The result was that in case of cold-worked and then annealed metals of Al-Pb alloys the (220) planes rocking curve breadth did not decrease so rapidly as high-purity aluminium. The integral breadth of (222), (422) planes, sometimes registered different movements from other planes.View full abstractDownload PDF (1807K) -
On the mechanical properties of miniature lader parabolic reflector made from Al-7% Si alloyTakuichi MORINAGA, Shigeo ZAIMA, Yukio AONO, Takayuki SHIMIZU1964 Volume 14 Issue 3 Pages 172-181
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSSome experiments on the mechanical properties of miniature lader parabolic reflector made of Al-7% Si casting alloy (AC4C) were performed. AC4C alloy is commonly in use for castings such as the housing or the case, because of its good casting properties and of excellent corrosion resistance. In this case, this alloy was selected with the reason that the reflector consists with many narrow and long ribs and has complicated shapes which require perfect filling with cast metal. Test pieces were taken properly from the casting and tested for the tensile strength, elongation, Brinell hardness and shearing strength. Furthermore discussed by comparing with the properties obtained by standard specimens cast at the same time. As standard specimen, metal mold cast one according to JIS also sand mold one according to the Federal Specification (USA) were tested.
Generally speaking, the results showed that the parabolic reflector casting can have nearly the same properties of sand mold standard specimen, if the casting temperature is well controlled, the venting of gases is carefully made and the riser is properly arranged.
This study was completed with the fund afforded by Light Metal Edueational Foundation Incorporation for which we are extremely gratefull.View full abstractDownload PDF (2345K) -
On the mechanical properties of suspension york made from 10% hydronarium (AC7BT4)Shigeo ZAIMA, Yoshihiko SUGITO, Kazuo MOCHIZUKI1964 Volume 14 Issue 3 Pages 182-188
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSSome experiments on the actual casting of suspension york cast with 10% hydronalium were done in order to obtain some data for machine design by ascertaining the different properties between actual casting and its test piece. It is a wellknown fact that the hydronalium, as an aluminium casting alloy, requires the highest technique in melting and casting, especially 10% hydronalium casting is more difficult in manufacturing than that of 5% Hydronalium owing to its higher sensibility to manufacturing condition, and there is a few reports on actual use.
With the above described reason, an actual casting having different thicknesses and shapes, presumably are apt to show different properties even in one cast body or some dispersion of properties between specimens taken out from the same melt. In this case, as an actual casting, suspension york for power distribution cable was selected as an object for investigation. The results showed, provided that paying great care for casting procedure, degassing and mold reaction, dispersion of properties can be kept within a limit as listed in table 4.
This investigation was done with the fund afforded by Light Metal Educational Foundation, Incorporation for which we are extremly gratefull.View full abstractDownload PDF (1389K) -
On the heat treatment and mechanical properties of Mg-Th-Zr alloyTakuichi MORINAGA, Tsuneo TAKAHASHI, Hisao KONNO, Yoshio SAWADA1964 Volume 14 Issue 3 Pages 189-193
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effects of chemical composition and heat treatment condition on the mechanical properties of Mg-Th-Zr alloys were investigated. Mg-Th mother alloy containing 10-25% Th prepared with ThF4 and magnesium was used for thorium addition to the Mg-Th-Zr alloys. The results obtained are as follows:
(1) In case of artificial aging of solution heat treated Mg-3% Th-0.7% Zr alloy, there are two step agehardening at aging temperatures from 180 to 205°C and one step age-hardening above 230°C.
(2) In case of the Mg-3%Th-0.7%Zr alloy, the higher the hardness, the better the mechanical properties at room temperature, from which it seems that both are proportionate.
(3) From a practical viewpoint, Mg-3% Th-0.7% Zr alloy solution heat treated at 565°C, for 2hr and artificial aged in 4hr at 280°C has the highest mechanical properties. It has ultimate tensile strength of 25.0kg/mm2, tensile yield strength of 12.5kg/mm2, elongation of 10.5% and hardness (Rockwell F scale) of 60.5.
(4) The elevated temperature mechanical properties above 200°C of Mg-3% Th-0.7% Zr alloy were obviously superior to AZ 63 alloy. It has ultimate tensile strength of 12.9kg/mm2, tensile yield strength of 8.3 kg/mm2 and elougation of 21.2% at 300°C as artificial aged for 4hr at 280°C.
(5) The addition of thorium up to 3.0% improves room and elevated temperature mechanical properties and the addition of zirconium up to 0.6% improves only the room temperature mechanical properties.View full abstractDownload PDF (695K) -
On the aging phenomena of Mg-3% Th-0.7%Zr alloyTakuichi MORINAGA, Tsuneo TAKAHASHI, Hisao KONNO1964 Volume 14 Issue 3 Pages 194-197
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe mechanism of age-hardening of Mg-3% Th-0.7% Zr alloy was investigated by measuring hardness, thermal expansion, electrical resistance, X-ray diffraction and microscopic observation. The results obtained are as follows:
(1) Two step age-hardening was found in the constant temperature aging from 175 to 225°C and elevating temperature aging with heating velocity 2°C/min. The age-hardening temperatures of the latter case are from 150 to 175°C and from 225 to 275°C.
(2) When thermal expansion and electrical resistance of solution heat treated sample in heating velocity 2°C/min were measured, changes of thermal expansion and electrical resistance were recognised at the same temperature of age-hardening of elevating temperature aging.
(3) The change of microstructure by age-hardening was not found by an optical microscope, but in the case of overage, the precipitate of ThMg5 in the structure was found.
(4) The change of the lattice constant was found in the elevating temperature aging.View full abstractDownload PDF (800K) -
Research Group For Finding Analytical Method Of So1964 Volume 14 Issue 3 Pages 198-207
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (1300K) -
Masatoshi KOBAYASHI1964 Volume 14 Issue 3 Pages 208-215
Published: May 31, 1964
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (827K)
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