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变质处理对 Al-17Si 合金组织和性能影响
Effect of Modification on Microstructure and Properties of Al-17Si Alloy
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- DOI:
- 作者:
- 何磊东，仲召军，李鹏鹏
HE Leidong， ZHONG Zhaojun， LI Pengpeng
- 作者单位:
- 江苏汇联铝业有限公司，江苏 连云港 222000
Jiangsu Huilian Aluminum Co., Ltd., Lianyungang 222000, China
- 关键词:
- 过共晶 Al-17%Si；变质处理；组织和性能
hypereutectic Al-17%Si; metamorphism; microstructure and properties
- 摘要:
- 未经变质处理过共晶铝硅合金微观组织主要有粗大的初晶硅和针状或层片状共晶体(α+Si)组成，会严重割
裂基体，其尖端和棱角会引起应力集中，使合金的力学性能明显下降，产品无法满足实际应用需求。 研究不同变质剂处
理方案对过共晶 Al-17%Si 合金微观组织和性能的影响。 结果表明：通过加入 0.36% Cu-P（14%P）合金和 0.40%稀土镧
铈(La-Ce)进行复合变质处理后，细化效果最佳，微观组织均匀细化和性能得到了优化。 抗拉强度由未变质 126 MPa 增
加到 167 MPa，增加了 33%；硬度由 123 HBW 降低到 111 HBW，降低了 10%；变质前后初晶硅形态并未发生变化，仍呈
现板条状形态，初晶硅的平均尺寸由 140 um 降至 55 um。
The microstructure of the unmodified eutectic Al-Si alloy was mainly composed of coarse primary silicon and acicular or lamellar eutectic (α+Si), which would seriously cut the matrix, and its tips and edges would cause stress concentration, which would significantly reduce the mechanical properties of the alloy, and the product can not meet the practical application requirements. The effects of different modifier treatment schemes on the microstructure and properties of hypereutectic Al-17%Si alloy were investigated. The results show that by adding 0.36% Cu-P (14%P) alloy and 0.40% rare earth lanthanum and cerium (La-Ce) to the composite modification treatment, the best refining effect, uniform microstructure refinement and optimized properties. The tensile strength increases from 126 MPa to 167 MPa without deterioration, increasing by 33% . The hardness decreases by 10% from 123 HBW to 111 HBW. The morphology of primary silicon remains the same before and after modification, and the average size of primary silicon decrease from 140 μm to 55 μm.