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热处理时铸造AlSiCuMg合金硅相形貌及力学性能的影响
Effect of Heat Treatment on Eutectic Silicon Morphology and Mechanical Property in AlSiCuMg Cast Alloys
查看参考文献11篇
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文摘
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通过对共晶硅相立体形貌的观察和定量金相学参数的测定，发现固溶处理过程中共晶硅相形貌的变化及其对合金力学性能的影响可划分为三个阶段：固溶初期硅相的熔断和钝化，使合金的塑性得到显著的提高；固溶中期以粒化为主，同时由于合金元素的充分固溶引起时效强化，合金的力学性能达到了峰值；固溶后期，硅相的粗化符合LSW粗化模型，硅相形貌呈现棱角小面特性，合金性能降低。同时，人工时效显微组织的TEM观察发现，合金峰时效时有过剩的硅质点析出，而且随着时效时间的延长，硅质点的长大很快，加速了合金的过时效。 |
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其他语种文摘
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After observation of eutectic silicon morphology of AlSiCuMg cast alloy and measurement of various parameters of silicon particles, it is found that, during solution heat treatment, the change of eutectic silicon particles morphology and mechanical property can be classified into three stages: In initial stage, breaking and passivation of silicon particles result in the improvement of plasticity of alloy. In intermediate stage, because of spheroidizing of silicon particles and compre-hensive dissolving of elements, the mechanical properties of alloy reach peak value. In the final stage, the coarsening process of silicon particles obeys the LSW theory and the morphology of sili-con particles is worsening. By TEM observation of samples aged at 175℃ for different time it is found some excess silicon particles precipitate during aging heat treatment and grow fast with pro-longation of aging time. |
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来源
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材料工程
,2003,0(7):26-30,35 【核心库】
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关键词
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铸造AlSiCuMg合金
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共晶硅相
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定量金相学
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过剩硅
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地址
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1.
沈阳工业大学材料学院, 沈阳, 110023
2.
中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:1179601
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