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Effects of solution treatment and aging process on microstructure refining of semi-solid slurry of wrought aluminum alloy 7A09

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 331-336页

作者： WU Xin HAN Fei WANG Wei-wei School of Material Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209China

A new method was exploited using solution treatment and aging process as a pretreatment in preparing semi-solid slurry with fine microstructure before isothermal treatment of wrought aluminum alloy *** of pretreatment were optimized by orthogonal experiment design and proper precursor was *** evolution of microstructure of semi-solid slurry during isothermal treatment was analyzed and the mechanism of microstructure refining was *** result of orthogonal experiment design shows that the optimum parameters are 462 ℃for solution temperature,40min for solution time,132 ℃for aging temperature and 14 h for aging *** of isothermal treatment is fine,homogenous,with globular solid grains and a solid fraction between 50%and 70%,which is qualified for later semi-solid forming *** of microstructure evolution includes the agglomeration ofα-phase and Ostwald *** prepared by solution and aging treatment prevent the grains from coarsening and promote the grain ripening to globular shape.

关键词： wrought aluminum alloy semi-solid slurry microstructure refining solution treatment aging

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Physical simulation of hot deformation of TiAl based alloy

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Journal of Central South University of Technology 2002年第2期9卷 73-76页

作者：张俊红黄伯云贺跃辉周科朝孟力平 StateKeyLaboratoryforPowderMetallurgy CentralSouthUniversityChangsha410083China／／ZhengzhouLight-metalInstituteZhengzhou450041China StateKeyLaboratoryforPowderMetallurgy CentralSouthUniversityChangsha410083China DepartmentofMaterialsScienceandEngineering CentralSouthUniversityChangsha410083China

In order to establish a model between the grain size and the process parameters, the hot deformation behaviors of Ti 49.5Al alloy was investigated by isothermal compressive tests at temperatures ranging from 800 to 1?100 ℃ with strain rates of 10 -3 10 -1 s -1 . Within this range, the deformation behavior obeys the power law relationship, which can be described using the kinetic rate equation. The stress exponent, n , has a value of about 5.0, and the apparent activation energy is about 320 J/mol, which fits well with the value estimated in previous investigations. The results show that, the dependence of flow stress on the recrystallized grain size can be expressed by the equation: σ=K 1d rex -0 56 . The relationship between the deformed microstructure and the process control parameter can be expressed by the formula: lg d rex =-0 281?1gZ +3 908?1.

关键词： hot deformation TiAl based alloy microstructure refining Zener Hollomon parameter

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