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Study on the Compression Deformation Behaviors of 5A30 Aluminum Alloy at Elevated Temperature

Author: ZhuZhenHua
Tutor: YuanGeCheng
School: Guangdong University of Technology
Course: Materials Processing Engineering
Keywords: 5A30 aluminum alloy Isothermal compression High temperature deformation Flow stress Dynamic recovery Dynamic recrystallization
CLC: TG146.21
Type: Master's thesis
Year: 2011
Downloads: 81
Quote: 1
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Abstract


This paper Gleeble-1500 thermal simulation testing machine for high temperature isothermal compression test, including high-temperature isothermal plastic deformation behavior of 5A30 aluminum alloy flow stress behavior and microstructure evolution of the conduct of the study. By OM, EDAX, SEM, TEM, the EBSD and mathematical regression analysis and other means to study alloy high-temperature plastic deformation process flow stress σ, strain ε, strain rate ε and temperature T, and the dynamic recovery and recrystallization behavior. The main contents and results are as follows: 1. Analysis of the variation of flow stress 5A30 aluminum alloy during hot compression deformation. When the deformation temperature of 300-500 ℃ and strain rate in the range of 0.001-1.Os-1, 5A30 aluminum alloy high-temperature plastic deformation process nearly steady state flow characteristics. The flow stress increases with decreasing deformation temperature and strain rate increases, 5A30 aluminum alloy for positive strain rate sensitive materials. 2. Proven relationship between the steady-state flow stress with Z parameters 5A30 aluminum alloy plastic deformation. The belong to dislocation motion control thermally activated process, the alloy high temperature isothermal deformation process high temperature deformation of the steady-state flow stress σ, strain rate ε and deformation temperature T satisfy the hyperbolic sine relationship ε = Asinh (ασ)] nexp (- Q / RT), the steady-state rheological behavior can be temperature compensated strain rate factor Zener-Hollomon parameter description. 3. Seeking Forget 5A30 aluminum alloy material constant high temperature deformation, including deformation activation energy Q, stress exponent n structure factor A and the parameters of the stress level α. Based on the above material constants obtained by regression analysis and minimum deviation method are respectively 160.94kJ/mol 3.314,3.058 × 109s-1 and 0.0184mm2 / N. Constant of these materials can be used to measure the characteristics of high-temperature plastic deformation of aluminum alloy, used to describe the relationship of the flow stress with the Z parameter, reveal deformed softening mechanisms, and can also provide data support for the aluminum alloy extrusion simulation. 4. 5A30 aluminum alloy high-temperature plastic deformation steady-state flow stress model. The steady-state flow stress model can be exponential function σ = the 2.735 × 104ε00007ε0.1758exp (-0.0076T) or power function σ = 4.063 × 1016ε0.0006ε0.1756T-5.9041 expression of two model errors are less than 8%, can provide a theoretical basis for the alloy plastic processing load estimation, equipment selection and process design. 5. Proven 5A30 aluminum alloy high temperature compression deformation microstructure evolution, further assessment of the average subgrain size and the relationship of the Z parameter values ??of the high temperature deformation. 5A30 aluminum alloy plastic deformation softening mechanism of dynamic recovery and dynamic recrystallization, when the temperature exceeds 350 ° C, 1nZ lt; 24.47 5A30 aluminum alloy, the occurrence of dynamic recrystallization phenomenon when 1nZ gt; 24.47, 5A30 aluminum alloy occurred dynamic recovery. The reciprocal of the average subgrain diameter d and Z parameter values ??also meet approximately linear relationship between the natural logarithm of the number of this relationship can provide the basis for the prediction and control for the the alloy heat distortion organizations. 6. Explore 5A30 aluminum alloy heat warm deformation temperature and strain rate affect the deformation activation energy of law and reason. Deformation activation energy of deformation temperature and strain rate control, which is more obvious effects of temperature on the activation energy. When less than 300 ℃ deformation, deformation activation energy. Thereafter, as the temperature increases, the deformation activation energy bigger when the temperature at about 350 ℃, deformation activation energy decreases; These variation 5A30 aluminum alloy second phase dissolution, precipitation and dislocation motion behavior.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Aluminum
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