About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Processing and Characterization
|
Presentation Title |
High Cycle Fatigue Properties of the Zr-modified Al-Si-Cu-Mg Alloy at Elevated Temperatures |
Author(s) |
Shouxun Ji, Guangyu Liu, Paul Blake |
On-Site Speaker (Planned) |
Shouxun Ji |
Abstract Scope |
The Al-Si-Cu-Mg alloy with 0.14wt%Zr addition has been studied against the counterparts of commercially used EN-AC-42000 (Al7Si0.5Cu) baseline alloy for the effect of Zr on the high cycle fatigue (HCF) properties at elevated temperatures. It was found that the fatigue life was significantly improved by 8-10 times at the high stress amplitude of 140 MPa in the Zr-modified alloy at all different temperatures. The fatigue strength coefficient of the baseline alloy was 574.9, 589.8, and 514.8 MPa at 150, 200, and 250 oC, respectively, which was greatly increased to 1412.3, 620.1, and 821.6 MPa for the Zr-modified alloy. The improved fatigue properties could be mainly ascribed to: (1) the refined microstructure, with α-Al grain size decreasing from 335 to 253 μm and the secondary dendrite arm spacing (SDAS) dropping from 39 to 28 μm; (2) the reduced porosity; and (3) the additional precipitates strengthening effect by the Al-Si-Zr-Ti dispersoids. |
Proceedings Inclusion? |
Planned: Light Metals |