Sr对AlSi9Cu3合金组织与力学性能的影响  

Effect of Sr on Microstructure and Mechanical Properties of AlSi9Cu3 Alloy

作　　者：汪闵 赵玉涛[1] 陶然[1] 印厚尚 杨永刚 WANG Min;ZHAO Yutao;TAO Ran;YIN Houshang;YANG Yonggang(School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《铸造技术》2018年第6期1153-1156,1160,共5页Foundry Technology

基　　金：国家自然科学基金资助项目(U1664254;U51174098)

摘　　要：研究了不同Sr含量对Al Si9Cu3合金力学性能及微观组织的影响规律。结果表明,当Sr含量为0.06%时,合金的变质效果最佳,合金中共晶硅相由粗大的针片状转变为细小的纤维状或颗粒状。过量的Sr会引起孔洞等铸造缺陷的增加。随着合金元素Sr含量的增加,合金的力学性能呈现先升后降的趋势。当Sr含量为0.06%时合金的强化效果达到峰值,抗拉强度和伸长率分别为288 MPa和13.23%,较未变质合金分别提高了25.2%和84.8%。继续添加Sr,合金的强塑性均下降,这与Sr对于共晶Si的变质效果规律结果是一致的。The effects of different Sr content on mechanical properties and microstructure of A1Si9Cu3 alloy were investigated. The results show that when the Sr content is 0.06 %, the modification effect of the alloy is the best, and the eutectie silicon phase of the alloy is transformed from a thick needle and flake to a small fibrous or particles. However, excessive Sr may cause the increase of casting defects such as porosity. With the increase of Sr content, the mechanical properties of the alloy show a trend of first increase and then decrease. When the Sr content is 0.06 %, the reinforcement effect of the alloy is up to peak, the ultimate tensile strength and elongation reach 288MPa and 13.23 %, respectively. The strong-plasticity properties of the alloy will be decreased with adding more Sr, which is consistent with the effect of Sr on the modification effect of eutectic Si.

关 键 词：AlSi9Cu3合金 Sr含量 微观组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]