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作者:

Du, Jingguang (Du, Jingguang.) | Yang, Yucheng (Yang, Yucheng.) | Ren, Yaojia (Ren, Yaojia.) | Wu, Hong (Wu, Hong.) | Shan, Quan (Shan, Quan.) | Wu, Xiaolan (Wu, Xiaolan.) | Lu, Yalin (Lu, Yalin.) | Baker, Ian (Baker, Ian.)

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EI Scopus SCIE

摘要:

High strength Al-Cu alloys are of great interest for processing using additive manufacturing for aerospace applications. In this study, a Ti-modified Al-Cu alloy was successfully processed by in -situ alloying laser powder bed fusion (LPBF). The relationship between the volumetric energy density (VED) and the densi-fication of a Ti-modified and unmodified Al-Cu alloy was investigated. The results showed that a high -density, crack-free Al-Cu alloy can be achieved with the addition of Ti. Hot cracks occurred along the coarse columnar grains in the unmodified Al-Cu alloy due to the severe stress concentrations arising during the LPBF process. The elimination of hot cracks was attributed to the decrease of grain size and the change of grain morphology from columnar to equiaxed with the Ti addition. The tensile properties of the Ti-modified Al-Cu alloy were significantly improved with a yield strength of 200 MPa, an ultimate strength of 289 MPa, and an elongation to failure of 8 %. The strengthening mechanisms including grain refinement strength-ening, solid solution strengthening and second phase strengthening were quantified and the fracture mechanism was discussed. The tribological results showed that a low wear rate of 3.03 x 10-4mm3 N-1 m-1 was achieved in the alloy with Ti modification, while unmodified alloy showed a poor wear resistance. The study demonstrates a novel method to develop advanced Al-Cu alloy with high density, strength and tri-bological resistance by in -situ alloying LPBF. & COPY; 2023 Elsevier B.V. All rights reserved.

关键词:

Hot crack Laser powder bed fusion Microstructural evolution Mechanical property Tribological behavior

作者机构:

  • [ 1 ] [Du, Jingguang]Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
  • [ 2 ] [Yang, Yucheng]Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
  • [ 3 ] [Ren, Yaojia]Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
  • [ 4 ] [Wu, Hong]Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
  • [ 5 ] [Shan, Quan]Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming 650031, Peoples R China
  • [ 6 ] [Wu, Xiaolan]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 7 ] [Lu, Yalin]Jiangsu Univ Technol, Sch Mat Engn, Changzhou 213001, Peoples R China
  • [ 8 ] [Baker, Ian]Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA

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来源 :

JOURNAL OF ALLOYS AND COMPOUNDS

ISSN: 0925-8388

年份: 2023

卷: 960

6 . 2 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

ESI高被引阀值:26

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