Improving the wear resistance of AA 6061 by laser surface alloying with NiTi

Hau Chung Man; S. Zhang; F. T. Cheng

doi:10.1016/j.matlet.2007.01.016

Improving the wear resistance of AA 6061 by laser surface alloying with NiTi

Hau Chung Man, S. Zhang, F. T. Cheng

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

63 Citations (Scopus)

Abstract

To improve the wear resistance of a popular aluminum alloy AA 6061, a 1.5 mm thick hard surface layer consisting of Ni-Al and Ti-Al intermetallic compounds was synthesized on the alloy by laser surface alloying technique. NiTi powder was preplaced on the aluminum alloy substrate and irradiated with a high-power CW Nd:YAG laser in an argon atmosphere. With optimized processing parameters, a modified surface layer free of cracks and pores was formed by reaction synthesis of Al with Ni and Ti. X-ray diffractometry (XRD) confirmed the main phases in the layer to be TiAl3and Ni3Al. The surface hardness increased from below 100 HV for untreated AA 6061 to more than 350 HV for the laser-treated sample. Accompanying the increase in hardness, the wear resistance of the modified layer reached about 5.5 times that of the substrate.

Original language	English
Pages (from-to)	4058-4061
Number of pages	4
Journal	Materials Letters
Volume	61
Issue number	19-20
DOIs	https://doi.org/10.1016/j.matlet.2007.01.016
Publication status	Published - 1 Aug 2007

Keywords

Aluminum alloy
In-situ synthesis
Intermetallic coating
Laser surface alloying
Wear

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matlet.2007.01.016

Cite this

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abstract = "To improve the wear resistance of a popular aluminum alloy AA 6061, a 1.5 mm thick hard surface layer consisting of Ni-Al and Ti-Al intermetallic compounds was synthesized on the alloy by laser surface alloying technique. NiTi powder was preplaced on the aluminum alloy substrate and irradiated with a high-power CW Nd:YAG laser in an argon atmosphere. With optimized processing parameters, a modified surface layer free of cracks and pores was formed by reaction synthesis of Al with Ni and Ti. X-ray diffractometry (XRD) confirmed the main phases in the layer to be TiAl3and Ni3Al. The surface hardness increased from below 100 HV for untreated AA 6061 to more than 350 HV for the laser-treated sample. Accompanying the increase in hardness, the wear resistance of the modified layer reached about 5.5 times that of the substrate.",

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AB - To improve the wear resistance of a popular aluminum alloy AA 6061, a 1.5 mm thick hard surface layer consisting of Ni-Al and Ti-Al intermetallic compounds was synthesized on the alloy by laser surface alloying technique. NiTi powder was preplaced on the aluminum alloy substrate and irradiated with a high-power CW Nd:YAG laser in an argon atmosphere. With optimized processing parameters, a modified surface layer free of cracks and pores was formed by reaction synthesis of Al with Ni and Ti. X-ray diffractometry (XRD) confirmed the main phases in the layer to be TiAl3and Ni3Al. The surface hardness increased from below 100 HV for untreated AA 6061 to more than 350 HV for the laser-treated sample. Accompanying the increase in hardness, the wear resistance of the modified layer reached about 5.5 times that of the substrate.

KW - Aluminum alloy

KW - In-situ synthesis

KW - Intermetallic coating

KW - Laser surface alloying

KW - Wear

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DO - 10.1016/j.matlet.2007.01.016

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Improving the wear resistance of AA 6061 by laser surface alloying with NiTi

Abstract

Keywords

ASJC Scopus subject areas

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