Vol.5 No.3 (May 2015)
The Quantitative Research of Deformation, Dislocation Density and Dislocation Strengthening in Al-Cu-Mg Alloy
张 劲 ：中南大学轻合金研究院，湖南 长沙
The quantitative research of deformation, dislocation density and aging strengthening in Al-Cu-Mg alloy during artificial aging was studied by tensile test, X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The results indicate that the pre-deformation increased the dislocation density of the alloy hot-rolled plate, refined the size of precipitated phase, improved the strength of alloy and reduced the time of peak aging. The dislocation density measured by TEM line intersection method and XRD profile method becomes higher with the increase of predeformation and the increase rate is gradually decreased. Finally it tends to saturation, and the function model of dislocation density and pre-deformation is established:ρ=1.28-1.08e-0.7ε . According to the experimental data, the curve of dislocation strengthening caused by pre-deformation and dis-location density is made, therefore, the dislocation strength of 67 MPa of the alloy hot-rolled plate at solid solution state is obtained, which accounts for 27% of strength of the alloy at solid solution state. And we obtain the relationship between dislocation strengthening and dislocation density: σd=150ρ1/2 .
雷郴祁 , 张 劲 , 邓运来 , 陈明安 (2015) Al-Cu-Mg合金的预变形、位错密度与位错强化的定量研究。 材料科学， 5， 126-133. doi: 10.12677/MS.2015.53018
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