Control mechanism of thermo-mechanical treatment on microstructure and mechanical properties of Al-Cu-Mg alloy
The effects of novel thermo-mechanical treatment(NTMT)process on the microstructure and macroscopic properties of Al-Cu-Mg alloy were investigated by means of X-ray diffractometer(XRD),transmission electron microscope(TEM),tensile mechanical properties test and fatigue crack growth rate test.The results show that the NTMT process can enable the mechanical properties of Al-Cu-Mg alloy achieve a good combination of strength and plasticity.Using solution hot rolling with 25％reduction,the asymmetric cryorolling with 30％reduction(r2)and the artificial aging at 100℃for 6 h,the elongation is 10.1％,and the tensile strength and yield strength of Al-Cu-Mg alloy are 517.2 MPa and 448.3 MPa,respectively,which are 74.8 MPa and 98.6 MPa higher than those of the conventional T6 Al-Cu-Mg alloy.The NTMT process causes a large number of dislocation tangles and small S phases in the alloy.The high-strength Goss texture and a large number of shear textures improve the fatigue performance of the alloy by affecting the deflection of fatigue cracks.
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