Microstructure Characteristic and Its Impact on Nano-hardness of LPBF-Processed Al-based Alloy with Ti Addition

doi:10.12442/j.issn.1002-185X.20230371

Home > Archive>Volume 53, Issue 3, 2024 >676-684. DOI:10.12442/j.issn.1002-185X.20230371

Microstructure Characteristic and Its Impact on Nano-hardness of LPBF-Processed Al-based Alloy with Ti Addition
DOI:
                        10.12442/j.issn.1002-185X.20230371
                    
Author:
                        Wang QiupingWang Qiuping
Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212003, China
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Guan JierenGuan Jieren
Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212003, China
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Affiliation:Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Clc Number:
Fund Project:Natural Science Foundation for Colleges and Universities of Jiangsu Province (22KJB430023); Youth Science and Technology Innovation Project of Jiangsu University of Science and Technology (1172922101)

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Abstract:

The influence of Ti addition into Al-based alloy fabricated by laser powder bed fusion (LPBF) technique was demonstrated. The microstructure characteristics, phase identification and nano-hardness of the LPBF-processed samples without or with 3wt% Ti addition were investigated by scanning electron microscope, electron backscatter diffraction, X-ray diffraction, transmission electron microscope and nano-indentation tests. The results reveal that a refined grain microstructure and lower average grain sizes can be obtained. Due to the heterogeneous nucleation provided by Al₃Ti precipitated phases, the ranges of grain sizes are reduced within 2.5 μm. As the low angle grain boundary increases, higher crystal lattice distortion energy contributes to the increase in average nano-hardness (to 2.36 GPa) and Young's modulus (to 92.72 GPa) values. The <100> texture of LPBF-processed Al-based alloy with 3wt% Ti addition is slightly enhanced, while there is still a random crystal orientation. The phase transformation from α-Al to Al₃Ti can be obtained.

Key words:laser powder bed fusion;microstructure;precipitated phase;nano-hardness;grain size

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[Wang Qiuping, Guan Jieren. Microstructure Characteristic and Its Impact on Nano-hardness of LPBF-Processed Al-based Alloy with Ti Addition[J]. Rare Metal Materials and Engineering,2024,53(3):676~684.]
DOI：10.12442/j. issn.1002-185X.20230371

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Received:June 12,2023
Revised:February 19,2024
Adopted:October 07,2023
Online: March 22,2024
Published: March 20,2024

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