预变形对高强度铝铜合金组织性能的影响

Effect of Plastic Deformation on Microstructure and Mechanical Properities of High Strength Al-Cu Alloy

通过拉伸和金相断口扫描观察研究了时效前预拉伸形变程度(1%、3%、5%、7%和9%)对新型高强度铝铜合金组织和性能的影响。结果表明,随变形量的增大,合金的强度缓慢增加,塑性缓慢下降,变形量为5%的强度为460 MPa,其塑性达到3%,强塑性匹配较好。这主要是因为预变形促进了基体中弥散强化相的析出,使组织中的析出相均匀分布。

The influences of plastic deformation before aging on microstructure and mechanical properties of a new high strength AI-Cu alloy were researched using tensile test and SEM. The results show that the tensile strength raises with the increase of the deformation ratios, but the elongation reduces. On the condition of the 5% plastic deformation, the tensile strength reaches 460 MPa, and the elongation is 3%. It is a higher tensile strength with a sufficient elongation. The explanation for the phenomenon above is that the plastic deformation promotes dispersion strengthening phase to precipitate sufficiently in matrix and to make the microstructure finer and more homogenous.