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Deformation mechanism at impact test of Al-11% Si alloy processed by equal-channel angular pressing with rotary die 被引量:2
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作者 马爱斌 Y. nISHIDA +3 位作者 江静华 n. saito I. SHIGEMATSU A. WATAZU 《中国有色金属学会会刊:英文版》 EI CSCD 2007年第1期104-109,共6页
Al-11%Si(mass fraction)alloy was transformed into a ductile material by equal-channel angular pressing(ECAP)with a rotary die.Two mechanisms at impact test,slip deformation by dislocation motion and grain boundary sli... Al-11%Si(mass fraction)alloy was transformed into a ductile material by equal-channel angular pressing(ECAP)with a rotary die.Two mechanisms at impact test,slip deformation by dislocation motion and grain boundary sliding,were discussed.The ultrafine grains with modified grain boundaries and the high content of fine particles(<1μm)were necessary for attaining high absorbed energy.The results contradict the condition of slip deformation by dislocation motion and coincide with that of grain boundary sliding.Many fine zigzag lines like a mosaic were observed on the side surface of the tested specimens.These observed lines may show grain boundaries appeared by the sliding of grains. 展开更多
关键词 铝合金 变形行为 微观结构 晶界滑动
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Corrosion behavior of hypereutectic Al-23%Si alloy (AC9A) processed by severe plastic deformation 被引量:1
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作者 江静华 马爱斌 +3 位作者 宋丹 n. saito 袁玉春 Y. nISHIDA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第2期195-200,共6页
Ultrafine-grained(UFG) hypereutectic Al-23%Si (mass fraction) alloy was achieved through equal-channel angular pressing(EACP) procedure. And the electrochemical properties after various ECAP passes were investigated i... Ultrafine-grained(UFG) hypereutectic Al-23%Si (mass fraction) alloy was achieved through equal-channel angular pressing(EACP) procedure. And the electrochemical properties after various ECAP passes were investigated in neutral NaCl solution. Potentiostatic polarization curves show that the corrosion potential of the ECAPed sample after 4 passes decreases markedly, while the corrosion current density reaches 1.37 times that of the as-cast alloy. However, the φcorr and Jcorr values after 16 passes are improved and approach those of the as-cast alloy. Immersion tests also show that the mass-loss ratio of ECAPed alloy decreases with increasing the pressing pass, which is lowered to 28.7% with the increase of pass number from 4 to 16. Pitting susceptibility of the ECAPed alloy after initial 4 passes is boosted, due to the presence of biggish voids resulted from the breakage of brittle large primary silicon crystals during ECAP. Increasing ECAP pass makes the voids evanesce and results in the homogeneous ultrafine-grained structure, contributing to a higher pitting resistance. These results indicate that enough ECAP passes are beneficial to increasing corrosion resistance of the hypereutectic Al-23%Si alloy. 展开更多
关键词 aluminum casting alloys ECAP corrosion behavior ultrafine grained microstructure
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Effect of microstructures on superplasticity of Al-11%Si alloy 被引量:1
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作者 江静华 马爱斌 +3 位作者 n. saito A. WATAZU 林萍华 Y. nISHIDA 《中国有色金属学会会刊:英文版》 CSCD 2007年第3期509-513,共5页
Three kinds of Al-11%Si (mass fraction) alloy samples with different processes were produced to investigate the effect of microstructures on its superplasticity. Among them, the as-ECAP sample pressed 16 passes has ul... Three kinds of Al-11%Si (mass fraction) alloy samples with different processes were produced to investigate the effect of microstructures on its superplasticity. Among them, the as-ECAP sample pressed 16 passes has ultrafine grains (300 nm) and the finest secondary particles. The ECAP-T6 sample, with ECAP 16 passes followed by T6 treatment, has fine secondary particles (3 μm) but the largest grains (8 μm). Contrarily, the T6-ECAP sample, with T6 treatment followed by ECAP 16 passes, has ultrafine grains and the large secondary particles (7 μm). The tensile testing results show that the as-ECAP sample exhibits superplasticity at high strain rate of 5.75×10-1 s-1 due to its fine secondary particles and ultrafine grains. The ECAP-T6 sample, however, does not exhibit superplasticity at the same high strain rate of 5.75×10-1 s-1 because it has relatively large secondary particles and large grains. Remarkably, the T6-ECAP sample does not have superplasticity even at the lower strain rate of 1.15×10-1 s-1, attributing to its comparatively large secondary particles. When most secondary particles are larger than 7 μm, the high strain rate superplasticity could not be obtained even if this sample has ultrafine grains. 展开更多
关键词 硅铝合金 微结构 粒子 超塑性能
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Processing of commercial magnesium alloys by different-speeds-rolling technique
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作者 董尚利 T. Imai +1 位作者 n. saito I. Shigemastu 《中国有色金属学会会刊:英文版》 CSCD 2005年第S2期284-287,共4页
The commercial pure magnesium, AZ31 and AM60 alloys have been processed by a different-speeds-rolling (DSR) technique in order to estimate the possibility of producing high performance magnesium sheets by severe plast... The commercial pure magnesium, AZ31 and AM60 alloys have been processed by a different-speeds-rolling (DSR) technique in order to estimate the possibility of producing high performance magnesium sheets by severe plastic deformation process. The experiment was carried out on a mill of which the rotation speed ratio of the upper roll to the lower roll could be varied from 1 to 1.364. Temperature of the two rolls of the mill could also be automatically controlled from room temperature to 300℃. The started billets with thickness of 10mm were cut from the cast ingot. The rolling parameters such as preheating temperature of the billet, rolling reduction per pass, rotation speed ratio and temperature of the rolls were carefully designed depending on the processed magnesium alloy. Mechanical properties of the successfully rolled sheets with final thickness of about 1mm were characterized, corresponding to microstructure development during the DSR-processing. The potential application of DSR to processing of magnesium alloys was discussed. 展开更多
关键词 MAGNESIUM ROLLING SEVERE plastic PROCESSING microstructure mechanical properties
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