浇注工艺对AlSi9Cu3合金凝固组织及力学性能的影响

Effect of Pouring Process on Microstructure and Mechanical Properties of AlSi9Cu3 Alloy

采用直读光谱仪、金相显微镜、拉伸试验机、JMatPro软件、扫描电镜和X射线衍射仪研究了浇注温度和模具温度对AlSi9Cu3合金凝固组织及力学性能的影响。结果表明:合金的凝固组织以初生α-Al和针状共晶硅为主;随浇注温度的降低,合金中α-Al晶粒尺寸先减小后增大;针状共晶硅含量逐渐增多;合金的抗拉强度先升高后降低;随模具温度的升高,合金中α-Al晶粒尺寸逐渐增大,针状共晶硅含量先减少后增加;合金的抗拉强度先升高后降低。当浇注温度为680℃、模具温度为100℃时,AlSi9Cu3合金的力学性能最佳。

The effects of pouring temperature and mold temperature on the solidification microstructure and mechanical properties of AlSi9Cu3 alloy were studied by direct reading spectrometer,metallographic microscope,tensile testing machine,JMatPro software,scanning electron microscope and X-ray diffractometer.The results showed that the solidification microstructure of the alloy was primaryα-Al and acicular eutectic silicon.As the temperature of pouring decreased,the grain size ofα-Al first decreased and then increased.The content of acicular eutectic silicon gradually increased.The tensile strength of the alloy first increased and then decreased.With the temperature of the mold temperature increased,the grain size of theα-Al increased gradually,the content of the acicular eutectic silicon decreased first and then increased.The mechanical properties of the AlSi9Cu3 alloy were the best when the pouring temperature was 680℃and the mold temperature was 100℃.