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Hot Deformation Behavior of 2026 Aluminum Alloy at Elevated Temperature

Author: HuangXuDong
Tutor: ZhangHui
School: Hunan University
Course: Materials Processing Engineering
Keywords: 2026 aluminum alloy Heat distortion Heat treatment Flow stress Microstructure
CLC: TG146.21
Type: Master's thesis
Year: 2009
Downloads: 175
Quote: 2
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Abstract


2026 aluminum alloy is improved on the basis of 2024 and 2214 aluminum alloy, reducing the Fe and Si content, add a small amount of Zr to inhibit recrystallization thermal processing, widely used in the fields of aviation and aerospace. This article by hot compression deformation experiments on Gleeble-1500 thermal simulation machine deformation temperature to 300-500 ° C, and the deformation rate of 0.01-10s-1. Study the relationship between the 2026 aluminum alloy high temperature flow stress and strain rate, deformation temperature and the degree of deformation, the flow stress model; proven means of OM, XRD, TEM analysis of the alloy during hot compression deformation microstructure evolution; deformed specimens in the solid solution of 500 ° C / 2 h and 180 ° C / 12h artificial aging treatment, different thermal deformation conditions on the microstructure and properties of the alloy after heat treatment. (1) 2026 aluminum alloy heat compression flow stress with increasing strain deformation and increases rapidly to a peak, then strain showed different degrees of increase decreases. Flow stress strongly depends on the strain rate and temperature, flow stress increases with increasing deformation temperature, with strain rate increased with the increase stabilized after the peak performance of dynamic recovery characteristics. Zener-Hollomon parameter Arrhenius hyperbolic sine form the hyperbolic sine relationships to describe the thermal deformation behavior of the alloy, the deformation activation energy Q 256.0177kJ/mol. (2) 2026 aluminum alloy during hot compression-like optical metallographic microstructure analysis and transmission electron microscopy analysis, increased with the the LNZ value (deformation temperature and strain rate decreases) decreases, elongated fibrous tissue grew , the occurrence of dynamic recovery and recrystallization; decrease in dislocation density; sub-grain size increases; Hot Compression Deformation precipitated Al 2 CuMg conditions phase, Al 3 Zr phase and a small amount of θ phase precipitated phase increased and grew up trend; 2026 aluminum alloy high-temperature compressive deformation softening mechanism by dynamic recovery and recrystallization gradually transformed into a dynamic particle precipitation and growth; dynamic recrystallization mechanism is a continuous dynamic recrystallization ( CDRX), also took place the discontinuous the dynamic recrystallization (DDRx,) and geometric dynamic recrystallization (GDRX). (3) 2026 aluminum alloy during hot compression sample solution and aging treatment before and after the micro Vickers hardness as LNZ value of the increase are the basic tendency of reduction. 2026 aluminum alloy during hot compression solution and aging treatment kind of microstructure analysis and transmission electron microscopy analysis, can be found: when the relatively large lnZ value, mainly equiaxed recrystallized grain and fine grain size; With lnZ value decreases, the equiaxed recrystallized grains is reduced and the grain size increases relatively few sample dislocation; when lnZ value comparing hrs, equiaxed recrystallized grains is relatively small, mainly elongated deformation organization; . Solid solution and artificial aging the samples after precipitation of Al 2 CuMg phase, the Zr phase the Al 3 and a small amount θ phase, precipitated phase increased and grew up trend, law before the heat treatment is basically the same.

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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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