摘要
采用挤压铸造工艺制备了高速机车用Al-Zn-Mg-Cu合金传动空心轴,研究了比压和Al-5Ti-1B+Al-10RE双细化剂对挤压铸造Al-Zn-Mg-Cu合金传动空心轴微观组织的影响。结果表明,随着比压的不断增大,挤压铸造Al-Zn-Mg-Cu合金空心轴试样中初生α-Al晶粒的形状不断变得圆整,晶粒尺寸不断变小;当比压达到160MPa时,初生α-Al晶粒中粗大的树枝晶基本消失,试样组织为非枝晶组织,试样的平均晶粒直径为25μm,平均等效圆度为0.73;随着双细化剂中Al-5Ti-1B加入量的减少、Al-10RE加入量的增加,试样的平均晶粒直径显著减小,而试样的平均等效圆度变化不大,基本上在0.65～0.75之间;当添加1%的Al-5Ti-1B+3%的Al-10RE时,试样的平均晶粒直径为21μm,平均等效圆度为0.70。
Effects of pressure and dual refiner（Al-5Ti-1B＋Al-10RE） addition on microstructure of the squeeze casting hollow Al-Zn-Mg-Cu alloy drive shaft were investigated.The results show that with increasing in pressure,primary Al phase in the hollow Al-Zn-Mg-Cu alloy drive shaft is refined with spheroidization.With increasing in pressure to 160MPa,the coarse dendrites are disappeared,and the non-dendritic structure is observed,where the average grain size and equivalent roundness reach 25 μm and 0.73,respectively.The average grain size is significantly refined with the fluctuation of average equivalent roundness at 0.65～0.75 with decreasing in Al-5Ti-1B and increasing in Al-10RE.With 1% Al-5Ti-1B and 3% Al-10RE,the specimens can be obtained with 21 μm in average grain size and 0.70 in average equivalent roundness.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2012年第7期633-636,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(50984057)
