P对过共晶A390合金铸态组织和力学性能的影响  

Effect of P on Cast Microstructure and Mechanical Properties of Hypereutectic A390 Alloy

作　　者：石为喜 鲁毅 汤梦超 李佳露 李晓晨 李贵茂[1] SHI Wei-xi;LU Yi;TANG Meng-chao;LI Jia-lu;LI Xiao-chen;LI Gui-mao(Department of Metallurgy Engineering,Liaoning Institute of Science and Technology,Benxi 117004,Liaoning,China)

机构地区：[1]辽宁科技学院冶金工程学院,辽宁本溪117004

出　　处：《铸造》2022年第3期331-335,共5页Foundry

基　　金：2021年辽宁科技学院大学生创新创业训练计划项目“基于过共晶铝硅合金变质处理的新型含稀土复合变质剂的研制”(202111430078);辽宁省教育厅基本科研项目(面上项目)(LJKZ1066);辽宁省自然科学基金(20180550265)。

摘　　要：采用Cu-14%P对过共晶A390合金进行变质处理。结果表明,P对A390合金中的初生硅有明显的细化作用,初生硅的晶粒尺寸从未变质的40~50μm细化至10~20μm,其尖角钝化,灰色CuAl_(2)相明显增多,共晶硅由长针状变为短棒状。XRD分析结果表明,在变质后的A390合金中检测到AlP中间相。力学性能测试表明,合金的抗拉强度从变质前的178 MPa提高到变质后的219 MPa,提高了23.0%;合金的伸长率从未变质0.28%提高到变质后的1.42%。The hypereutectic A390 alloy was modified by Cu-14%P.The results showed that P had an obvious refining effect on the primary silicon in the A390 alloy,and the grain size of unmodified primary silicon was refined from 40~50μm to 10~20μm after P modification.The sharp corner of the primary silicon was passivated,the gray CuAl_(2) phase structure increased obviously,and the eutectic silicon structure changed from long needle to short rod after P modification.The results of XRD analysis showed that AlP mesophase was detected in the modified A390 alloy.The mechanical properties test showed that the tensile strength of the alloy increased from 178 MPa before modification to 219 MPa after P modification,which increased by 23.0%.The elongation of the alloy increased from 0.28% to 1.42% after P modification.

关 键 词：过共晶铝硅合金 P变质 初生硅 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]