首页|Microstructural origins of high strength of Al-Si alloy manufactured by laser powder bed fusion:In-situ synchrotron radiation X-ray diffraction approach

Microstructural origins of high strength of Al-Si alloy manufactured by laser powder bed fusion:In-situ synchrotron radiation X-ray diffraction approach

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The microstructural factors contributing to the high strength of additive-manufactured Al-Si alloys us-ing laser-beam powder bed fusion(PBF-LB)were identified by in-situ synchrotron X-ray diffraction in tensile deformation and transmission electron microscopy.PBF-LB and heat treatment were employed to manufacture Al-12％Si binary alloy specimens with different microstructures.At an early stage of de-formation prior to macroscopic yielding,stress was dominantly partitioned into the α-Al matrix,rather than the Si phase in all specimens.Highly concentrated Si solute(～3％)in the α-Al matrix promoted the dynamic precipitation of nanoscale Si phase during loading,thereby increasing the yield strength.After macroscopic yielding,the partitioned stress in the Si phase monotonically increased in the strain-hardening regime with an increase in the dislocation density in the α-Al matrix.At a later stage of strain hardening,the flow curves of the partitioned stress in the Si phase yielded stress relaxation owing to plastic deformation.Therefore,Si-phase particles localized along the cell walls in the cellular-solidified microstructure play a significant role in dislocation obstacles for strain hardening.Compared with the results of the heat-treated specimens with different microstructural factors,the dominant strengthening factors of PBF-LB manufactured Al-Si alloys were discussed.

Laser powder bed fusionAluminum alloysMicrostructuresX-ray diffraction(XRD)Strain hardening

Naoki Takata、Mulin Liu、Masahiro Hirata、Asuka Suzuki、Makoto Kobashi、Masaki Kato、Hiroki Adachi

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Department of Materials Process Engineering,Graduate School of Engineering,Nagoya University,Furo-cho,Chikusa-ku,Nagoya 464-8603 Japan

Graduate School of Engineering,University of Hyogo,Himeji 671-2280,Japan

Aichi Center for Industry and Science Technology,1267-1 Akiai,Yakusa-cho,Toyota 470-0356 Japan

JST PRESTOLight Metal Educational Foundation,Inc.(Japan)"Knowledge Hub Aichi"Aichi Prefectural Government(Japan)synchrotron radiation experiments were performed at BL46XUof Spring-8with the approval of the Japan Synchrotron Radiation Resynchrotron radiation experiments were performed at BL46XUof Spring-8with the approval of the Japan Synchrotron Radiation Resynchrotron radiation experiments were performed at BL46XUof Spring-8with the approval of the Japan Synchrotron Radiation Re

JP-MJPR22Q42021A16632022A10012022A1798

2024

10.1016/j.jmst.2023.08.050

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.178(11)
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