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Ti-6.5Al-3.5Mo-1.5Zr-0.3Si合金绝热剪切和局部流动行为
引用本文:王克鲁,鲁世强,董显娟,李鑫,欧阳德来.Ti-6.5Al-3.5Mo-1.5Zr-0.3Si合金绝热剪切和局部流动行为[J].航空学报,2009,30(10):1967-1972.
作者姓名:王克鲁  鲁世强  董显娟  李鑫  欧阳德来
作者单位:南昌航空大学,材料科学与工程学院,江西,南昌,330063
基金项目:江西省自然科学基金,江西省教育厅科技项目,江西省材料科学与工程中心基金 
摘    要: 在THERMECMASTOR-Z型热模拟机上对Ti-6.5Al-3.5Mo-1.5Zr-0.3Si合金在变形温度780~1 080 ℃,应变速率0.001~70.000 s-1条件下的流动应力变化规律进行了研究,分析了变形工艺参数对Ti-6.5Al-3.5Mo-1.5Zr-0.3Si合金绝热剪切和局部流动行为的影响,并采用基于动态材料模型的功率耗散图分析了Ti-6.5Al-3.5Mo-1.5Zr-0.3Si合金易发生绝热剪切和局部流动的热力参数范围。结果表明:在所研究的热变形条件下,当温度较高、应变速率较低时,变形呈稳态流动特征,当温度较低、应变速率较高时,变形呈流动软化特征。通过功率耗散图分析及微观组织观察可知,在α+β两相区变形,应变速率高于0.100 s-1时,功率耗散系数多数小于0.16,变形多处于流变失稳区域,其变形机制主要为绝热剪切和局部流动。

关 键 词:钛合金  绝热剪切带  局部流动  功率耗散图  微观组织  

Behavior of Adiabatic Shear and Flow Localization of Alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si
Wang Kelu,Lu Shiqiang,Dong Xianjuan,Li Xin,Ouyang Delai.Behavior of Adiabatic Shear and Flow Localization of Alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si[J].Acta Aeronautica et Astronautica Sinica,2009,30(10):1967-1972.
Authors:Wang Kelu  Lu Shiqiang  Dong Xianjuan  Li Xin  Ouyang Delai
Institution:School of Materials Science and Engineering, Nanchang Hangkong University
Abstract:The hot deformation behaviors of alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si in the temperature range from 780 ℃ to 1 080 ℃, strain rate range from 0.001 s-1 to 70.000 s-1 are studied by means of isothermal constant strain rate compressing testing on a THERMECMASTOR-Z hot simulator, and the characteristics of flow stress curves and the effect of the deformation parameters on adiabatic shear and flow localization are obtained. The power dissipation map is developed on the basis of the flow stress data as a function of temperature, strain rate,and strain. The results show that the flow stress is sensitive to deformation temperature and strain rate. The flow softening characteristic appears at the range of low temperature and high strain rate while the steady state flow characteristic appears at the range of high temperature and low strain rate. As revealed by the power dissipation map and microstructure, alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si exhibits a wide region of flow instability manifested by adiabatic shear bands and flow localization at the strain rate above 0.100 s-1 in the α+β phase field in which the power dissipation efficiency is less than 0.16.
Keywords:titanium alloys  adiabatic shear band  flow localization  power dissipation map  microstructure
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