| Microstructural Evolution and Thermal Stability of Ultra-fine Grained Al-4Mg Alloy by Equal Channel Angular Pressing |
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| 作者姓名： | Hongbin GENG Subbong KANG Shiyu HE School of Materials Science and Engineering Harbin Institute of Technology Harbin China Korea Institute of Machinery and Materials Sangnam Dong Changwon Kyungnam - South Korea |
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| 作者单位： | Hongbin GENG;Subbong KANG;Shiyu HE School of Materials Science and Engineering，Harbin Institute of Technology Harbin 150001，China Korea Institute of Machinery and Materials，66 Sangnam Dong，Changwon，Kyungnam 641-010，South Korea |
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| 摘 要： | Experiments were conducted to evaluate the grain refinement and thermal stability of ultra-fine grained Al-4Mgalloy introduced by equal-channel angular pressing (ECAP) at 473 K. The results show that the intensities of X-ray(111/222) and (200/400) peaks for the alloy processed by ECAP decrease significantly and the peak widths of halfheight become broadening compared with the corresponding value in the annealed alloy. The microstructure of 2passes ECAPed alloy consists of both elongated and equiaxed subgrains. The residual strain in the alloy increaseswith increasing passes numbers, that appears as increasing dislocation density and lattice constant of matrix. Anequiaxed ultra-fine grained structure of～0.2μm is obtained in the present alloy after 8 passes. The ultra-fine grainsare stable below 523 K, because the alloy retains extremely fine grain size of～1μm after static annealing at 523 Kfor 1 h.
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Microstructural Evolution and Thermal Stability of Ultra-fine Grained Al-4Mg Alloy by Equal Channel Angular Pressing |
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| Hongbin GENG,Subbong KANG,Shiyu HE School of Materials Science and Engineering,Harbin Institute of Technology Harbin ,China Korea Institute of Machinery and Materials, Sangnam Dong,Changwon,Kyungnam -,South Korea.Microstructural Evolution and Thermal Stability of Ultra-fine Grained Al-4Mg Alloy by Equal Channel Angular Pressing[J].Journal of Materials Science & Technology,2004,20(3):315-318. |
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| Authors: | Hongbin GENG Subbong KANG Shiyu HE |
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| Affiliation: | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;Korea Institute of Machinery and Materials, 66 Sangnam Dong, Changwon, Kyungnam 641-010, South Korea |
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| Abstract: | Experiments were conducted to evaluate the grain refinement and thermal stability of ultra-fine grained Al-4Mg alloy introduced by equal-channel angular pressing (ECAP) at 473 K. The results show that the intensities of X-ray (111/222) and (200/400) peaks for the alloy processed by ECAP decrease significantly and the peak widths of half height become broadening compared with the corresponding value in the annealed alloy. The microstructure of 2 passes ECAPed alloy consists of both elongated and equiaxed subgrains. The residual strain in the alloy increases with increasing passes numbers, that appears as increasing dislocation density and lattice constant of matrix. An equiaxed ultra-fine grained structure of ～0.2μm is obtained in the present alloy after 8 passes. The ultra-fine grains are stable below 523 K, because the alloy retains extremely fine grain size of ～1μm after static annealing at 523 K for1 h. |
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| Keywords: | Aluminum alloy Equal channel angular pressing Ultra-fine grain Microstructural stability |
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