不同形变储能超高强铝合金在不同速度升温过程中的微结构演变
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摘要
采用电导率、硬度测试、X射线衍射(XRD)分析、电子背散射衍射(EBSD)检验,研究了不同初始形变储能微合金化超高强铝合金Al-11.54Zn-3.51Mg-2.26Cu-0.24Zr在不同速度升温过程中的微结构演变。结果表明:升温过程中合金电导率随升温终止温度的升高先增大后减小,硬度先减小后增大。合金位错密度在退火温度达到300至450℃时降低为0,温度达到470℃时,重新产生了位错。合金在升温至300℃时晶粒平均尺寸略有减小,升温至470℃时合粒尺寸显著增大。初始形变储能的提高能够减小晶粒平均尺寸、低角度晶界比例,提高位错与晶界强化。
The effects of different initial energy storage on the microstructure of Al-11.54 Zn-3.51 Mg-2.26 Cu-0.24 Zr super high strength aluminum alloy at different heating rates were explored by electrical conductivity, hardness, EBSD and XRD analysis. The results show that the conductivity first increases and then decreases with the increase in heating blocking temperature, while the hardness first decreases and then increases. The dislocation density of the alloy declines to 0 when the annealing temperature is between 300 ℃ and 450 ℃; however, the dislocation reappears when the annealing temperature reaches 470 ℃. The average grain size of the alloy decreases slightly during heating annealing to 300 ℃, and it increases significantly when annealed to 470 ℃. With the initial deformation energy storage improving, the average grain size and low angle grain boundary proportion is reduced, and the dislocation and grain boundary strengthening is improved.
The effects of different initial energy storage on the microstructure of Al-11.54 Zn-3.51 Mg-2.26 Cu-0.24 Zr super high strength aluminum alloy at different heating rates were explored by electrical conductivity, hardness, EBSD and XRD analysis. The results show that the conductivity first increases and then decreases with the increase in heating blocking temperature, while the hardness first decreases and then increases. The dislocation density of the alloy declines to 0 when the annealing temperature is between 300 ℃ and 450 ℃; however, the dislocation reappears when the annealing temperature reaches 470 ℃. The average grain size of the alloy decreases slightly during heating annealing to 300 ℃, and it increases significantly when annealed to 470 ℃. With the initial deformation energy storage improving, the average grain size and low angle grain boundary proportion is reduced, and the dislocation and grain boundary strengthening is improved.
引文
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[5]Chen Kanghua(陈康华),Fang Huachan(方华婵),Zhang Zhuo(张茁)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2009,38(4):607
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[7]Zhao Y H,Liao X Z,Jin Z et al.Acta Materialia[J],2004,52(15):4589
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