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Ti、Sc微合金化后的铝合金组织及性能研究
Microstructure and Properties of Ti and Sc Microalloyed Aluminum Alloys
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- DOI:
- 作者:
- 陈华 余爱武 叶青 齐海雁 施祥玲 杨成刚 石磊 皮刚
CHEN Hua;YU Aiwu;YE Qing;QI Haiyan;SHI Xiangling;YANG Chenggang;SHI Lei;PI Gang
- 作者单位:
- 上海航天设备制造总厂有限公司 南昌航空大学
Shanghai Aerospace Equipments Manufacturer Co.,Ltd.,Shanghai 200245,,China;Nanchang Hangkong University,Nan-chang 330063,China
- 关键词:
- 微观组织 力学性能 固溶强化 复合强化相 异质形核核心
microstructure mechanical properties solid solution strengthening composite strengthening phase heterogeneous nucleating core
- 摘要:
- 通过向工业纯铝中单独或复合添加微量Ti、Sc元素,研究了Ti、Sc微合金化对合金组织和力学性能的影响。结果表明,0.2%Sc对晶粒的细化效果不佳,但Sc元素的固溶强化作用可使合金的强度和硬度得到有效的提高,而伸长率略有降低;0.2%Ti具有良好的晶粒细化效果,使合金的组织完全转变为等轴晶,同时合金的强度和塑性显著提高,但硬度变化不显著;0.2%Sc和0.2%Ti复合细化效果更加优,合金平均晶粒尺寸仅在80μm左右,合金的强度、伸长率和硬度最佳。Ti、Sc复合微合金化可以降低了Al-Sc共晶点,Ti可以代替Al3Sc中部分Sc形成Al3(Sc,Ti)复合强化相,可以作为α(Al)的异质形核核心,从而细化组织,强化合金。
The effects of Ti and Sc microalloying on the microstructure and mechanical properties of industrial pure aluminum were investigated by adding microelements Ti and Sc or in combination to industrial pure aluminum. The results show that the grain refinement effect of 0.2% Sc is not ideal,but the strength and hardness of the alloy can be improved effectively,while the elongation is slightly reduced by the solid solution strengthening effect of Sc element. While 0.2% Ti has a good grain refining effect,the microstructure of the alloy is completely transformed into equiaxed grains,and the strength and plasticity of the alloy are significantly improved,but the hardness is not significantly changed. The average grain size of the alloy is only about 80 μm,and the strength,elongation and hardness of the alloy are the best. The eutectic point of Al-Sc can be reduced by Ti/Sc composite microalloying. The Al3( Sc,Ti) composite strengthening phase can be formed by Ti instead of some Sc in Al3 Sc,which can be used as the heterogeneous nucleating core of α( Al),so as to refine the microstructure and strengthen the Al alloy.