| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Development in Light Weight Alloys and Composites
|
| Presentation Title |
Friction Stir Processing Based Local Microstructure Modification to Improve High-cycle Fatigue Properties of High-pressure Die-cast Aluminum Alloy |
| Author(s) |
Avik Samanta, Hrishikesh Das, Glenn J. Grant, Saumyadeep Jana |
| On-Site Speaker (Planned) |
Avik Samanta |
| Abstract Scope |
High-pressure die-cast (HPDC) aluminum alloys can provide a prospective pathway for lightweighting in vehicle industries by replacing structural components with large, thin wall and complex-shaped castings. However, microstructural defects such as shrinkage and gas porosity, entrapped oxide inclusions, etc., in HPDC material results in limited fatigue properties, affecting its prospect as a structural material. Friction stir processing (FSP) has emerged as an efficient technique to locally modify microstructure through severe plastic deformation. In this work, we report enhancement of high cycle fatigue life of HPDC A380 alloy through local FSP induced microstructure modification. High cycle fatigue property is evaluated in a 4-point bending mode configuration at stress ratios of R = 0.1 on through-thickness specimens. A 10-fold improvement in fatigue life is observed over the parent HPDC material after FSP modification. Considering the improvement, mechanisms of fatigue crack initiation and propagation are investigated. |