| Effect of pre-aging on precipitation behavior of Al-1.29Mg- 1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Zn-0.1Ti alloy |
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| 作者姓名： | 刘宏 陈扬 赵刚 刘春明 左良 |
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| 作者单位： | School of Mechanical Engineering Shandong Institute of Light Industry Ji'nan 250100 China，College of Material and Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China，School of Materials and Metallurgy North eastern University Shenyang 110004 China，School of Materials and Metallurgy North eastern University Shenyang 110004 China，School of Materials and Metallurgy North eastern University Shenyang 110004 China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 1 Introduction Aluminum alloys of the 6000 series, containing Mg and Si as the major solutes, are strengthened by the precipitation of metastable precursors of the equilibrium β(Mg2Si) phase. The precipitation of these metastable precursors occurs in on…
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| 关 键 词： | β" nucleus |
| 收稿时间： | 2006-02-16 |
| 修稿时间： | 2006-04-26 |
Effect of pre-aging on precipitation behavior of Al- 1.29Mg- 1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Zn-0.1 Ti alloy |
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| LIU Hong,CHEN Yang,ZHAO Gang,LIU Chun-ming,ZUO Liang.Effect of pre-aging on precipitation behavior of Al-1.29Mg- 1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Zn-0.1Ti alloy[J].Transactions of Nonferrous Metals Society of China,2006,16(4):917-921. |
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| Authors: | LIU Hong CHEN Yang ZHAO Gang LIU Chun-ming ZUO Liang |
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| Affiliation: | 1. School of Mechanical Engineering, Shandong Institute of Light Industry, Ji''nan 250100, China;2. College of Material and Chemical Engineering, Liaoning Institute of Technology, Jinzhou 121001, China;3. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;;2. Shoudu Aerospace Machinery Company, Beijing 100071, China;1. Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, PR China;2. Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing 100871, PR China;1. Fatigue and Fracture Laboratory, School of Mechanical Engineering, Center of Excellence in Experimental Solid Mechanics and Dynamics, Iran University of Science and Technology, Narmak, Tehran 16846, Iran;2. Centre of Advanced Manufacturing and Material Processing (AMMP), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | By means of Vickers-hardness and electrical conductivity measurements, DSC tests and TEM analyses, the effect of different pre-aging treatments on precipitation characteristic of the Al-1.29Mg-1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Fe-0.1Ti (mass fraction, %) alloy during subsequent artificial aging was investigated. The results indicate that with increasing pre-aging time from 2.5 min to 10 min at 170 °C, the number of formed β” nuclei increases, resulting in promoting artificial aging kinetics and enhancing peak hardness. The hardness of pre-aged alloy reduces within lower temperature range of non-isothermal aging and increases in early stage of isothermal aging at 170 °C. The size and density of clusters in pre-aged samples determine the hardenability in early stage of artificial aging. Pre-aging has dual mechanisms: namely, clusters (β” nuclei) formed by pre-aging can inhibit the precipitation of GP zones during natural aging, and can quicken the precipitation of β” phase in the early stage of subsequent artificial aging. |
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| Keywords: | aluminum alloys pre-aging non-isothermal aging isothermal aging |
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