Influence of friction stir processing on the room temperature fatigue cracking mechanisms of A356 aluminum alloy

Nelaturu, Phalgun; Jana, Saumyadeep; Mishra, Rajiv S.; Grant, Glenn; Carlson, Blair E.

doi:10.1016/j.msea.2018.01.044

Influence of friction stir processing on the room temperature fatigue cracking mechanisms of A356 aluminum alloy

Journal Article · Thu Jan 11 00:00:00 EST 2018 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2018.01.044· OSTI ID:1418022

Nelaturu, Phalgun ^[1]; Jana, Saumyadeep ^[2]; Mishra, Rajiv S. ^[1]; Grant, Glenn ^[2]; Carlson, Blair E. ^[3]

Univ. of North Texas, Denton, TX (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
General Motors Technical Center, Warren, MI (United States)

Here, failure by fatigue is a common problem associated with cast aluminum alloys due to defects like shrinkage porosities, non-metallic inclusions, etc. Friction stir processing (FSP) has recently emerged as an effective technique for local modification of microstructure. This study investigates the fatigue crack initiation and growth mechanisms in cast and FSPed A356 aluminum alloy. Two sets of parameters were used to friction stir the cast alloy resulting in the complete modification the cast microstructure to a wrought microstructure. Both the FSPed microstructures exhibited severe abnormal grain growth (AGG) after heat treatment leading to a multimodal grain size distribution – the grain sizes ranging from a few microns to a few millimeters. One of the FSP conditions displayed an excellent improvement in fatigue life by an order of magnitude, while the other condition displayed an unexpectedly large scatter in fatigue lives. Detailed study of the fractured fatigue specimens by electron back scattered diffraction (EBSD) revealed that both, fatigue crack initiation and propagation, were intimately tied to the grain size as well as the grain misorientations in the microstructure.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1418022

Report Number(s):: PNNL-SA--130375; PII: S0921509318300534

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 716; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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