Effects of pre-deformation mode and strain on creep aging bend-forming process of Al−Cu−Li alloy
Transactions of Nonferrous Metals Society of China(2020)
Abstract
Abstract The bending deformation method was adopted to characterize the creep deformation behavior of Al−Cu−Li alloy in the creep aging forming (CAF) process based on a series of CAF tests, and the evolution laws of its mechanical properties and microstructures under different pre-deformation conditions were studied. The results show that the bending creep strain characterization method can intuitively describe the creep variation. With the increase of the pre-deformation strain, the creep strain of the specimen firstly increases and then decreases. The increase of the pre-deformation strain can promote the course of aging precipitation, and improve the formed alloy’s tensile properties at room temperature, the Kahn tearing properties, and the fatigue propagation properties. Pre-rolled specimens produce a slightly weaker work hardening than pre-stretched specimens, but they also create a stronger aging-strengthening effect; thus the strength, toughness and damage performance can be improved to some extent. Among all the types of specimens, the specimen with 3% rolling after CAF treatment has the best comprehensive mechanical properties.
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Key words
Al−Cu−Li alloy,creep aging forming,pre-deformation,bending creep strain,microstructure evolution,mechanical properties
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