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考察了Sr变质及固溶时效对铝硅合金组织和性能的影响。结果表明,随Sr量的增加,铝硅合金中共晶硅的形貌由粗大的板片状经过针片状,最后转变成了细小的纤维状。当加入0.04%Sr变质时,合金抗拉强度达到最大值183 MPa;固溶时效处理使得经Sr变质及AlTiB细化处理的铝合金中的共晶硅相发生了粒化,变成更加圆整的形态,并随保温时间延长而粗化。铸造铝硅合金经固溶时效处理后的硬度比铸态有显著提高。535℃×6h固溶+170℃×10h时效时,铝硅合金的硬度值最高可达84.4 HBS。
The effect of Sr modification and solution aging on microstructure and properties of Al-Si alloy was investigated. The results show that with the increase of Sr content, the morphology of the eutectic silicon in the Al-Si alloy is changed from a coarse plate-like shape to a needle-like shape and finally into a fine fibrous shape. When adding 0.04% Sr, the tensile strength of the alloy reaches the maximum of 183 MPa. The solution aging treatment causes the eutectic silicon phase in the aluminum alloy refined by Sr and AlTiB refinement to become more rounded Morphology, and coarsening with the holding time extension. Cast aluminum-silicon alloy by the solution after aging hardness than the cast has significantly improved. 535 ℃ × 6h solution + 170 ℃ × 10h aging, the hardness of aluminum-silicon alloy up to 84.4 HBS.