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研究了过量Si含量对原位自生15Mg2Si/Al复合材料组织与力学性能的影响。结果表明,随着Si含量的增加,初生Mg2Si的平均尺寸先增大后减小,当Si含量为5%时,初生Mg2Si的尺寸为41μm,而当增加到10%时,初生Mg2Si的尺寸减小到24μm。同时,随着过量Si含量的增加,Al-Mg2Si二元共晶组织逐渐减少,直至基本消失。另外,α-Al也随着Si含量的增加而发生球化,当Si含量为8%时,α-Al的形貌接近球形。随着过量Si含量从0增加到10%,原位自生15Mg2Si/Al复合材料的抗拉强度从172MPa增加到200MPa,伸长率从1.4%提高到3.1%。
The effect of excessive Si content on the microstructure and mechanical properties of in-situ 15Mg2Si / Al composites was investigated. The results show that with the increase of Si content, the average size of primary Mg2Si first increases and then decreases. When the content of Si is 5%, the size of primary Mg2Si is 41μm. When the content of Si increases, the size of primary Mg2Si decreases As small as 24μm. At the same time, the binary eutectic structure of Al-Mg2Si decreases gradually with the increase of Si content, until it disappears. In addition, α-Al also spheroidized with the increase of Si content. When the Si content was 8%, the morphology of α-Al was nearly spherical. With the increase of Si content from 0 to 10%, the tensile strength of in-situ 15Mg2Si / Al composites increases from 172MPa to 200MPa, and the elongation increases from 1.4% to 3.1%.