|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Elevated-temperature Low Cycle Fatigue Behaviors of Al-Si 356 and 319 Foundry Alloys
||S. Chen, Kun Liu, X. G. Chen
|On-Site Speaker (Planned)
In the present study, two typical Al-Si foundry alloys, namely 356-T7 and 319-T7 were investigated to discover their low cycle fatigue (LCF) behaviors at 300°C. The LCF tests were performed at various strain amplitudes of 0.1-0.6%. The fatigue behavior was characterized by the cyclic strain-stress response, hysteresis loops and Masing as well as the fatigue parameters and fracture analysis. Results showed that both alloys present nearly ideal Masing behavior with symmetric hysteresis loops. Meanwhile, the cyclic softening occurs in both alloys but the softening rate varies with alloys, which is lower in 356-T7 than 319-T7. Moreover, 356-T7 behaved more ductile while 319-T7 exhibited higher strength during cyclic deformation. 356-T7 achieved higher low-cycle fatigue life than 319-T7. The different LCF behaviors of these two alloys may be attributed to the presence of various precipitates due to the variation of Mg and Cu contents.
||Planned: Light Metals