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Volume 27, Issue 2
Displaying 1-9 of 9 articles from this issue
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Toshisada Mori, Kyozo Shinmyo, Eiji Ichise, Akira Morooka1963 Volume 27 Issue 2 Pages 49-53
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe nitrogen solubilities were measured on austenitic Fe-Cr and Fe-Mn binary alloys in order to study the effects of alloying elements on the activity of nitrogen in austenite and to obtain the interaction parameters of alloying elements. Samples used were Fe-Cr alloys with Cr content up to15% and Fe-Mn alloys with Mn content up to 6% and the experimental temperatures were 1050°C, 1150°C and 1250°C.
Solubility measurements were carried out by the quenching method, which were proposed by N.S.Corney and E.T.Turkdogan.
Both Cr and Mn were found to decrease the activity of nitrogen in austenite and the interaction parameters were calculated as follows:
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Toshisada Mori, Kyozo Shinmyo, Eiji Ichise, Shinji Koyama1963 Volume 27 Issue 2 Pages 53-58
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe nitrogen solubility in austenite was measured on Fe-Ni binary alloy in order to study the effect of nickel on the activity of nitrogen in austenite and to obtain the interaction parameter of nickel. Samples used were the Fe-Ni alloys with Ni content up to 100% and the experimental temperatures were 1050° and 1250°C. Ni increases the activity of nitrogen in austenite and the interaction parameter εN(Ni) is 4.5 at 1050°C and 4.1 at 1250°C.
The nitrogen solubilities in pure γ-iron under various partial pressure of nitrogen were measured at 1150°C and result shows that Sieverts’ law is obeyed for nitrogen absorption in γ-iron.
A close relationship between the interaction parameters and the atomic number of the added elements was observed and it was also found that the absolute value of the interaction parameter was decreased with the increase in temperature.View full abstractDownload PDF (338K) -
Sadami Tomita1963 Volume 27 Issue 2 Pages 59-63
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSEddy current in magnetic material give rise to energy loss. For thin tape, theoretical analysis show that the eddy current loss is proportional to the frequency of a.c. field (f) and square of thickness of tape (d2). On ultrathin Mo-permalloy core, hysteresis loop was measured at frequency ranging from 1 Kc/s to 70 Kc/s. For magnetic tape thinner than 10 μ, the energy loss is greater than that predicted by the d2f low.
On the ultrathin permalloy, the eddy current loss is greater, being due to the localized movement of domain wall. Examining of a.c. hysteresis loop at high frequency leads to an classifying of kinetics of domain reversal for thickness of the tape of thin permalloy material.View full abstractDownload PDF (398K) -
Seizo Kainuma, Yasuo Uehara1963 Volume 27 Issue 2 Pages 63-67
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSBitter patterns were observed on thin films of 80Ni-20Fe (Film I) and 82.5Ni-17.5Fe (Film II) alloys electrodeposited without magnetic field onto mechanically polished copper substrates. Domain motions in these films were examined during various magnetic processes. It was found that (1) in the “Film I”, domain walls fell into scratches and the easy axis was induced parallel to the scratches and (2) in the “Film II”, 180° domain walls appeared nearly perpendicular to the scratches and the average easy direction was perpendicular to the scratches in several films, while, in the other films, the domain patterns were very complicated. The results can be interpreted qualitatively.View full abstractDownload PDF (920K) -
Isao Gokyu, Keijiro Suzuki1963 Volume 27 Issue 2 Pages 68-73
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIt has previously been shown that the plastic anisotropy of metals as measured by the ratio R of width strain to thickness strain in a tension test correlates generally with crystallographic orientation as determined by X-ray pole figures. It is possible to predict the R ratio through theoretical treatment of orientation.
Burns and Heyer calculated theoretical ratio of width strain to thickness strain for two specific orientations of the b.c.c. system, using ⟨111⟩ as the operative slip direction. These calculated values were in fairly good agreement with the ratios determined by tension test of low-carbon steel in which these preferred orientation existed. But we are doubtful to test strictly the relation between the R ratio and the texture for low-carbon steel with less preferred orientation.
So we used the copper sheets having very sharp (001)[100] recrystallization texture to verify the validity of the proposed orientation. We determined R ratio in the tensile specimens taken from the cubic texture sheet cut at 0°, 15°, 30°, 45°, 60°, 75° and 90° to the rolling direction. We obtained following results, (1) The calculated value is in very good agreement with measured R ratio. The R value is dependent on the crystallographic anisotropy of metals. (2) The tensile deformation of specimen cut 45° to the rolling direction can be explain to proceed by the slip on the slip systems act (1\={1}1)[011] and (1\={1}1)[\={1}01] simultaneously. These systems act co-operatively as if they were the simple slip system (1\={1}1)[\={1}12].View full abstractDownload PDF (504K) -
Shiro Terai, Yoshio Baba1963 Volume 27 Issue 2 Pages 74-79
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSExperiments were carried out to study the stretcher-strain markings and yield phenomena in aluminium-lithium (1.0∼3.0%) binary alloy.
Two different types of yield phenomena in Al-3%Li alloy were observed in the precipitated state of second phase and in the aged state after solution heat-treatment.
The former was observed in the non-recrystallized sheet with stretcher-strain markings when it was annealed at 300°∼375°C after having had intermediate heat-treatment at 340°C. Then, the yield phenomenon became more pronounced with the reduction of cold working but it had no connection with anisotropy in the annealed sheet.
The yield phenomenon which was observed in the latter in the state of being aged at 110°∼190°C after having had solution heat-treatment at 520°C was small and free from stretcher-strain markings, and it was more similar to that of Al-Mg alloy than the former because it could be eliminated by the 3% skin pass or by the control of grain size to above 0.055 mm.
Regarding to the mechanism of the yield phenomenon in the former, it might be due to the contribution of small and stable precipitates to resist the movement of dislocations, while in the latter, this phenomenon might be due to the dislocation pinning casused by the segregation of lithium atoms in aluminium matrix or the atmosphere locking.View full abstractDownload PDF (608K) -
Shiro Terai, Yoshio Baba1963 Volume 27 Issue 2 Pages 79-83
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSAs a result of studying the effects of the purity of aluminium and the heat-treatment on the “Work Softening” phenomenon of aluminium, it was found that this phenomenon was observed in the special state of the commercially pure aluminium.
For example, 99.2% aluminium sheet annealed at 240°C after cold rolling, increased the elongation from 16 to 25% and decreased the proof stress from 12.0 to 10.6 kg/mm2 and the tensile strength from 12.5 to 11.8 kg/mm2 with reduction of 1% by cold rolling, after the annealing.
This “Work Softening” phenomenon was observed in the half hard sheet of 99.2% and 99.8% aluminium annealed at the final temperature of about 240°C when cold rolled with reduction of 1 to 5%, if the ingot had been preheated at 500°C for 24 hrs. It was also observed that this phenomenon had no connection with the intermediate annealing and the anisotropy of the sheets.
“Work Softening” phenomenon was not observed in 99.99% aluminium and the commercially pure aluminium obtained from the ingot not preheated.View full abstractDownload PDF (653K) -
Yasuo Kimura1963 Volume 27 Issue 2 Pages 84-89
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSVicalloy specimens composed of 2∼3%Cr, 9∼8%V, 52%Co, balance Fe were reduced in thickness from 33% to 93% by cold-rolling and then subjected to tempering at temperatures between 100° and 750°C. The severer is the cold reduction, the higher become the saturation magnetization and uniaxial roll magnetic anisotropy.
The easy direction of uniaxial roll magnetic anisotropy in rolled state is perpendicular to the rolling direction. After tempering at about 400°C, the uniaxial magnetic anisotropy disappers, a slight cubic magnetic anisotropy remaining only. After tempering at about 600°C, the uniaxial magnetic anisotropy appears again, but its easy direction becomes parallel to the rolling direction. When the cold-rolled alloys are tempered at 500°∼600°C, the coercive force and mechanical hardness increase, but the saturation induction decreases. In this case, the severer is the degree of cold reduction, the harder is the mechanical hardness, but the lower is the coercive force. An increase of the coercive force is due to the partial transformation of the alpha phase to the gamma phase, during which finely dispersed particles of the gamma phase are formed.
The saturation magnetization and coercive force as a function of the temperature from −70° to +530°C are measured. The saturation magnetization of specimens reduced slightly in thickness increases rapidly below +80°C and the highest value of coercive force is obtained at about +80°C. However, in the case of severe reduction, the curves of the saturation magnetization and of coercive force as a function of the temperature do not reveal the above-mentioned changes.View full abstractDownload PDF (460K) -
Masataka Sugiyama, Hisashi Suzuki, Takaaki Kido, Keizo Morita1963 Volume 27 Issue 2 Pages 90-94
Published: 1963
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe effects of alloying elements and also of annealing treatments on the mechanical properties of Zn-Cu-Ti type alloys contained 0∼1.0%Cu and 0∼0.30%Ti were mainly investigated. The experimental results were as follows: (1) Alloying element of Cu was thought contributable to strengthen the matrix and to improve the ductility of the alloys, but to have no effect on the heat resisting properties of them. (2) The heat resisting properties were chiefly obtained by additive element of Ti and they appeared to relate to dispersed TiZn15 particles developed in the matrix. (3) Hardness and strength of the alloys were increased by adequate low-temperature annealing, and their high-temperature strength and the creep-rupture properties were also improved by this heat treatment. Annealing temperature to get the best properties was dependent on the content of Ti. The most suitable temperature was ranged from 150° to 180°C for the alloys containing more than about 0.10% of Ti. (4) Mechanical properties of the alloys were not affected by small content of Cr or Mn addition. (5) The most suitable composition range in these wrought Zn-Cu-Ti type alloys was concluded to be 0.4∼1.0%Cu and 0.05∼0.15%Ti.View full abstractDownload PDF (514K)
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