Isothermal compression tests in a wide range of temperatures （300-500 ℃） and strain rates （0.001-10 s^-1）, were performed on 2099 alloy to reveal the hot deformation characteristics. In order to give a precise pr...Isothermal compression tests in a wide range of temperatures （300-500 ℃） and strain rates （0.001-10 s^-1）, were performed on 2099 alloy to reveal the hot deformation characteristics. In order to give a precise prediction of flow behavior, the obtained experimental data were modified by friction and temperature correction and then employed to derive the constitutive modeling. The effects of the temperature and strain rate on hot deformation behavior can be expressed by Zener-Hollomon parameter including Arrhenius term. Furthermore, the influence of strain was incorporated in the constitutive analysis by considering the effect of strain on material constants （i.e. a, n, Q and A）. Consequently, the flow stress curves predicted by the developed modeling show a good agreement with the corrected ones, which indicates that the developed constitutive modeling could give an accurate and precise prediction for the flow stress of 2099 alloy.展开更多
对2099铝锂合金微观组织及性能在热机加工过程中的演变进行研究。研究结果表明:枝晶粗大,晶界偏析严重的铸态合金经双级均匀化(510℃/12 h+530℃/36 h)处理后,树枝晶消失,晶界偏析基本消除,晶界上残余有少量的Al Cu Fe Mn/Al Cu Mn颗粒...对2099铝锂合金微观组织及性能在热机加工过程中的演变进行研究。研究结果表明:枝晶粗大,晶界偏析严重的铸态合金经双级均匀化(510℃/12 h+530℃/36 h)处理后,树枝晶消失,晶界偏析基本消除,晶界上残余有少量的Al Cu Fe Mn/Al Cu Mn颗粒。均匀化后的铸锭在450℃进行热挤压,获得直径为16 mm的合金棒。合金经固溶处理后,平行于挤压方向上,中心区域形成强的{111}?112?织构和次强的{111}?110?织构,表层区域形成{112}?110?织构。中心区域的织构强度较表层的强。合金心部和表层硬度(HV)分别为95和120。在峰时效条件下,大量的T1和δ′相以及少量的θ′相在基体中析出。合金相应的抗拉强度,屈服强度和伸长率分别为613 MPa,597 MPa和7.9%。随着时效时间的延长,合金应力腐蚀敏感性降低。在过时效条件下,合金获得理想的抗应力腐蚀性能,强度损失率为5.5%。展开更多
文摘Isothermal compression tests in a wide range of temperatures （300-500 ℃） and strain rates （0.001-10 s^-1）, were performed on 2099 alloy to reveal the hot deformation characteristics. In order to give a precise prediction of flow behavior, the obtained experimental data were modified by friction and temperature correction and then employed to derive the constitutive modeling. The effects of the temperature and strain rate on hot deformation behavior can be expressed by Zener-Hollomon parameter including Arrhenius term. Furthermore, the influence of strain was incorporated in the constitutive analysis by considering the effect of strain on material constants （i.e. a, n, Q and A）. Consequently, the flow stress curves predicted by the developed modeling show a good agreement with the corrected ones, which indicates that the developed constitutive modeling could give an accurate and precise prediction for the flow stress of 2099 alloy.
文摘对2099铝锂合金微观组织及性能在热机加工过程中的演变进行研究。研究结果表明:枝晶粗大,晶界偏析严重的铸态合金经双级均匀化(510℃/12 h+530℃/36 h)处理后,树枝晶消失,晶界偏析基本消除,晶界上残余有少量的Al Cu Fe Mn/Al Cu Mn颗粒。均匀化后的铸锭在450℃进行热挤压,获得直径为16 mm的合金棒。合金经固溶处理后,平行于挤压方向上,中心区域形成强的{111}?112?织构和次强的{111}?110?织构,表层区域形成{112}?110?织构。中心区域的织构强度较表层的强。合金心部和表层硬度(HV)分别为95和120。在峰时效条件下,大量的T1和δ′相以及少量的θ′相在基体中析出。合金相应的抗拉强度,屈服强度和伸长率分别为613 MPa,597 MPa和7.9%。随着时效时间的延长,合金应力腐蚀敏感性降低。在过时效条件下,合金获得理想的抗应力腐蚀性能,强度损失率为5.5%。
