| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5454585 | Materials Characterization | 2017 | 9 Pages |
Abstract
Multi-level tension-compression tests were carried out on A7N01-T4 samples undergoing a series of non-isothermal heat treatments beforehand. Transmission Electron Microscopy (TEM) and Differential Scanning Calorimetry (DSC) were performed to analyze the evolution of precipitations. Thermal cycles have significant influence on its plastic constitutive relation. In an interval of peak temperature from 350 °C to 450 °C, the alloy re-precipitates a large number of non-shearable ηⲠand η precipitates and mainly presents kinematic hardening characteristic due to the anisotropy induced by Orowan Loop Helped Reverse Bypass (OHRB) mechanism. Strengthening precipitates grow coarser below this interval and decompose into aluminum matrix over this interval, which are in favor of the dislocation shearing and interaction, and lead to an isotropic hardening behavior of the alloy.
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Authors
Yi Duan, Jijin Xu, Jingyao Chen, Chun Yu, Junmei Chen, Hao Lu,