| 微量Sc在Al—Mg合金中的作用 |
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| 引用本文： | 潘青林,尹志民,邹景霞,陈显明,张传福. 微量Sc在Al—Mg合金中的作用[J]. 金属学报, 2001, 37(7): 749-753 |
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| 作者姓名： | 潘青林 尹志民 邹景霞 陈显明 张传福 |
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| 作者单位： | 中南大学材料科学与工程系,长沙,410083 |
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| 基金项目： | 国家自然科学基金59671003，国家重点基础研究基金 G1999064909资助项目 |
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| 摘 要： | 研究了微量Sc对Al-Mg合金显微组织与拉伸性能的影响，结果表明，微量Sc在Al-Mg合金中主要以初生Al3Sc和次生Al3Sc两种形式存在，初生Al3Sc是合金在凝固过程中形成的，可成为有效的非均质晶核，大大细化合金的铸态晶粒，次生Al3Sc是合金铸锭在工艺加热过程中析出的，有效地钉扎位错和亚晶界，稳定亚结构并强烈抑制合金的再结晶，具有亚结构强化和直接析出强化作用，因此，加入Sc后的Al-Mg合金的强度大大提高，并且表现出良好的强塑性配合。
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| 关 键 词： | Al－Mg－Sc合金 Al3Sc 显微组织 力学性能 铝合金 |
| 文章编号： | 0412-1961(2001)07-0749-05 |
| 修稿时间： | 2000-11-14 |
EFFECTS OF MINOR Sc ADDITION ON MICROSTRUC- TURE AND TENSILE PROPERLY OF Al-Mg ALLOY |
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| PAN Qinglin,YIN Zhimin,ZOU Jingxia,CHEN Xianming,ZHANG Chuanfu. EFFECTS OF MINOR Sc ADDITION ON MICROSTRUC- TURE AND TENSILE PROPERLY OF Al-Mg ALLOY[J]. Acta Metallurgica Sinica, 2001, 37(7): 749-753 |
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| Authors: | PAN Qinglin YIN Zhimin ZOU Jingxia CHEN Xianming ZHANG Chuanfu |
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| Abstract: | The effects of minor addition of Sc on microstructure and tensile property of Al-Mg alloy have been investigated. The results show that minor Sc mainly exists in the form of primary Al3Sc and secondary Al3Sc. Sc addition can produce a substantial refinement of the grain size of aluminium alloy castings due to the formation of the primary Al3Sc intermetallic phase during solidification. Secondary Al3Sc dispersoids precipitating from the supersaturated a(Al) solid solution in the heating process of ingot can effectively pin dislocation and subgrain boundary, stabilize substructure as well as inhibit the recrystallization of Sc containing Al-Mg alloy during hot rolling and annealing. The addition of Sc significantly increases the strength of the alloy and makes alloy get a superior combination of strength and ductility. |
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| Keywords: | Al-Mg-Sc alloy Al3Sc microstructure tensile property |
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