In situ synchrotron X-ray diffraction analysis of ultrasonically assisted microstructure refinement during laser melting process

Wang, Tianzhao; Schneiderman, Benjamin; Clark, Samuel J.; Chuang, Andrew Chihpin; Yu, Zhenzhen; Liu, Xun

doi:10.1016/j.scriptamat.2023.115946

In situ synchrotron X-ray diffraction analysis of ultrasonically assisted microstructure refinement during laser melting process

Journal Article · Sat Dec 23 00:00:00 EST 2023 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2023.115946· OSTI ID:2368845

^[1]; ^[2]; Clark, Samuel J. ^[3]; Chuang, Andrew Chihpin ^[3]; ^[2]; ^[1]

The Ohio State Univ., Columbus, OH (United States)
Colorado School of Mines, Golden, CO (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

This work investigates the effect of ultrasonic treatment (UST) on the microstructure of AA4043 alloy during laser melting process. Here, the study utilizes in situ synchrotron X-ray diffraction (SXRD) and postmortem electron backscatter diffraction (EBSD) techniques to examine the ultrasonic grain refinement mechanism. The SXRD diffraction patterns exhibit higher continuity of major diffraction rings in the UST-test pattern, indicating a more refined grain structure. The presence of new diffraction spots in the post-test diffraction pattern with UST suggests the breakdown of epitaxial growth of columnar dendrites during solidification. Thermal profiles determined by analyzing the lattice parameter evolution show a faster cooling rate with UST. The inverse pole figures and aspect ratio distribution from EBSD reveal that the UST samples exhibit a refined, more equiaxed grain structure along the weld centerline. UST sample also develops more fine-sized low angle grain boundaries (LAGBs). These features offer better hot-cracking resistance in aluminum alloys.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2368845

Alternate ID(s):: OSTI ID: 2263255

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 242; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
electron backscatter diffraction
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laser melting
ultrasonic treatment

In situ synchrotron X-ray diffraction analysis of ultrasonically assisted microstructure refinement during laser melting process

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