Improvement of Strength and Electrical Conductivity of Copper Alloy by Means of Thermo-Mechanical Treatment
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1. N.S. Stoloff: International Metals Review, 1984, vol. 29, no. 3, pp. 123-35. 2. K. Aoki and O. Izumi: J. of Jpn. Inst. Metal, 1979, vol. 43, pp. 1190-96. 3. A.I. Taub, S.C. Huang, and K.M. Chang: Metall. Trans. A, 1984, vol. 15A, pp. 399-402. 4. C. C. Koch, J. A. Horton, C. T. Llu, O. B. Cavin, and J. O. Scarbrough:
Rapid Solidification Processing, Principles and Technologies Ill,
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R. Mehrabian, ed., National Bureau of Standards, 1983, pp. 264-69.
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for alloys with different boron contents. The results show that the corrosion rate (current density) decreased with increasing boron content and all the samples exhibited passivation behavior. For the 0.1 B alloy, the passivation starting current (ivs) and passivation completed current (ip~) were 3.2 × 10 and 3.1 × 10 1 mA, respectively. For the boronfree alloy, ips and ire were found to be 7.2 x 10 and 1.0 mA, respectively. For further study of anodic polarization behavior, repetitive anodic polarization tests were performed at room temperature in 10N-H3PO4 with a scan rate of 20 mV per minute for the boron-free and 0.1 B alloys. The values of ips, ir~, Eps (passivation starting potential), and Er~ (passivation completed potential) for B-free and 0.1 B alloys are replotted as a function of the number of repetition in Figures 3(a), (b), (c), and (d), respectively. For the saturated state, ip¢ and Ep~ were found to be 0.9 mA and 270 mV for the 0.1 B alloy, while those of the B-free alloy were 3.2 mA and 360 mV, respectively. The results show that boron additions (0.1 wt pct) improved the corrosion resistance of polycrystalline Ni3A1 in the H3PO4 solution.
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Improvement of Strength and Electrical Conductivity of Copper Alloy by Means of Thermo-Mechanical Treatment A. ROTEM and A. ROSEN
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(d) Fig. 3--Variation of ips, i~, Eps, and Ep~ in repetition curves of Ni3A1alloys: (a) ip~, (b) ir~, (c) Eps, and (d) Ep~.
converter were used for the corrosion test. Rest potentials (E rest) and potentiostatic anodic potentials were measured at room temperature in electrolytes as a function of boron content. The electrolytes tested were various concentrations of HC1, H2SO4, NaC1, and H3PO 4. The effect of boron content on corrosion potentials (E rest) in 1N-HC1, 1N-H2SO4, and 0.05 N-NaC1 is shown in Figure 1. The rest potential decreased with increasing boron content, regardless of the electrolyte. The 0.1 pct B alloy exhibited the lowest rest potential, while the boron-free alloy displayed the highest rest potential. Figure 2 shows the anodic potential (SCE) v s current density in 3N-H3PO4 METALLURGICAL TRANSACTIONS A
The Cu-Be-Ni alloy, UNS C17510, belongs to the family of precipitation hardening copper alloys and is noted for its excellent combina
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