Microstructure and wear behavior of Mn-modified high-strength AlCu alloy fabricated via laser powder bed fusion

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL Tribology International Pub Date : 2025-03-18 DOI:10.1016/j.triboint.2025.110660

Zehao Qin , Nan Kang , Ruidi Li , Wenling Zhang , Mohamed El Mansori

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Abstract

In this work, a new Mn-modified AlCuMgSiTi alloy with a high relative density of 99.5 % was processed via laser powder bed fusion (LPBF) technology. The influence of Mn addition on the solidification microstructure was investigated through multiscale characterization methods, and the wear behavior of the modified alloy was evaluated via a ball-on-flat tribometer against 100Cr6 steel under three different loads (2.1 N, 10 N, and 24 N). The results demonstrate that the formation of bimode columnarequiaxed grains is attributed to the addition of Ti with nanosized Al₃Ti particles, whereas Mn is oversaturated and solid-solved within the matrix, with no significant Mn precipitation observed. This oversaturation increases the distortion of the Al matrix, improving the strain hardening capability and oxidation resistance of the material. As a result, the wear rates after Mn modification were reduced by 78.4 %, 66.7 %, and 56.8 % under 2.1 N, 10 N, and 24 N loads, respectively, compared with those of the LPBF AlCuMgSiTi alloy.

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.