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Grain growth behavior of ti-6.5al-3.5mo-1.5zr-0.3si alloy during isothermal β heat treatments

Rare Metals 2019年第3期38卷 233-237页

作者： De-Lai Ouyang Hai-Ming Du Xia Cui Shi-Qiang Lu Xian-Juan Dong School of Materials Science and Engineering Nanchang Hangkong University Department of Environmental Art Design Jiangxi Normal University School of Aeronautical Manufacturing Engineering Nanchang Hangkong University

Isothermal β heat treatments of ti-6.5 al-3.5 mo-1.5 zr-0.3 si alloy were performed at the temperature of1040-1240 ℃ to examine the influence of heating conditions on grain growth of the alloy. The results show that the grain size increases with heating temperature and holding time increasing. Rapid β grain growth of the alloy takes place at the temperature of over 1140 ℃. The grain growth kinetics for the alloy follows the classical isothermal grain growth law.The growth time exponent(n) of 0.5651 and activation energy(Q) of 129.6 kJ mol-1 are determined. Finally, in order to determine the grain size under different heating conditions,the grain growth model of the alloy was established.

关键词： Isothermal heating ti-6.5al-3.5mo-1.5zr-0.3si alloy Grain growth model

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Constitutive equation and hot deformation characteristic of ti-6.5al-3.5mo-1.5zr-0.3si alloy with equiaxed microstructure

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Rare Metals 2007年第S1期26卷 88-93页

作者： HUANG Lujun,GENG Lin,LI Aibin,WANG Guisong,and SHI Lei School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The hot deformation behavior of ti-6.5al-3.5mo-1.5zr-0.3si alloy with equiaxed microstructure was characterized in the temperature range of 900～1060 ℃ and strain rate range of 10.3～10 s-1.The experimental results indicate that the plastic deformation behavior of the titanium alloys is rather sensitive to temperature and strain rate.In the α+β phase temperature region,all of the stress-strain curves exhibit different degrees of the flow softening after a peak stress.In the β phase temperature region,the titanium alloy shows a stress softening at high strain rates and a steady flow stress at low strain rates.On the basis of the peak stress data,the constitutive equations were constructed in the α+β phase temperature region and β phase temperature region,respectively.Activation energy parameters were calculated to be 344.923 kJ·mol-1 in the β phase temperature region and 628.3 kJ·mol-1 in the α+β phase temperature region.Microstructure of the compressed specimens in water-quenched conditions was found to be quite dependent on the conditions of deformation.

关键词： constitutive equation hot deformation ti-6.5al-3.5mo-1.5zr-0.3si

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