Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8011743 | Transactions of Nonferrous Metals Society of China | 2017 | 9 Pages |
Abstract
Transmission electron microscopy (TEM), scanning electron microscopy (SEM), hardness tests and tensile tests were performed to investigate the effect of aging on microstructure and mechanical properties of forged Al-4.4Cu-0.7Mg-0.6Si alloy. The results show that the alloy exhibits splendid mechanical properties with an ultimate tensile strength of 504 MPa and an elongation of 10.1% after aging at 170 °C for 16 h. With tensile testing temperature increasing to 150 °C, the strength of the alloy declines slightly to 483 MPa. Then, the strength drops quickly when temperature reaches over 200 °C. The high strength of the alloy in peak-aged condition is caused by a considerable amount of θⲠand AlMgSiCu (Q) precipitates. The relatively stable mechanical properties tested below 150 °C are mainly ascribed to the stability of θⲠprecipitates. The growth of θⲠand Q precipitates and the generation of θ phase lead to a rapid drop of the strength when temperature is over 150 °C.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Hui-zhong LI, Ze-xiao ZHU, Xiao-peng LIANG, Peng-wei LI, Ye-long QI, Feng LV, Lan HUANG,