Fatigue Behavior of Semi-Solid Formed A357-T6 Aluminum 2001-01-0413
The fundamental relationship between semi-solid processing and microstructure and their effect on the flow characteristics of semi-solid metals have been studied for several years. However, how the process related microstructure influences fatigue properties has not been given the same attention. This study examines the influence of process-related microstructure on the fatigue properties of semi-solid formed A357 alloys. High-solid-fraction (62% solid) and low-solid-fraction (31% and 36% solid) semi-solid formed A357 was tested in axial fatigue with a stress ratio (R) equal to -1. The high solid fraction (HSF) material had better fatigue properties than the low solid fraction (LSF) material. This is attributed to the fatigue crack initiation mechanisms, as related to the fatigue crack initiation features and the strengths of the materials.
Timothy G. Basner, Robert D. Pehlke, Anil K. Sachdev
Delphi Automotive Systems, University of Michigan, General Motors R&D Center
SAE 2001 World Congress
Developments in Lightweight Aluminum Alloys for Automotive Applications: 2001-2005-PT-130, Automotive Casting Processes and Materials-SP-1603, SAE 2001 Transactions Journal of Materials & Manufacturing-V110-5