摘要
本文研究了Al-Si合金宏观晶粒尺寸与Si量的关系及结构演化规律.结果表明:宏观晶粒尺寸随含Si量增加呈峰谷变化,即在3%Si(质量分数,下同)左右达到谷底,在共晶点(12%Si)附近达到峰值;未变质共晶 Al-Si合金的宏观晶粒尺寸与纯Al相近. Al-Si合金宏观晶粒的结构随含Si量增加发生演化,其演化过程为:单-α-Al→以α→Al为中心外围被共晶团环绕→单-共晶团组织-初生 Si为核心、周围环α-Al及共晶团的三层组织结构、变质后AI-Si合金的延伸率也呈现出峰谷变化规律,并且在共晶点附近其力学性能达到了峰值.
The sudden size change and structure evolution rule of the macro-grains of Al-Si alloys with increasing Si content were studied. It was found that the macro-grain sizes change suddenly in the form of peak-valley, that is, the macro-grain sizes are in the valley when Si content is near 3% (mass fraction) and at the peak value near the eutectic point (near 12%), the macro-grain sizes of unmodified eutectic Al-Si alloy are coarse almost as that of pure aluminum. It was also found that with increasing Si content the structures of the macro-grains are gradually evolving and the process of evolution can be described as single α-Al→α-Al surrounded by eutectic-single eutectic cell-primary Si crystals surrounded orderly by α-Al and eutectic. With Si increasing, the ductility variation rule of modified Al-Si alloys also has the form of peak-valley, and the mechanical properties reach peak values near the eutectic point.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第3期225-229,共5页
Acta Metallurgica Sinica
关键词
结构演化
宏观晶粒
力学性能
尺寸突变
铝硅合金
Al-Si alloy, macro-grain size, structure evolution, mechanical property
