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Shvoong Home>Science>Microstructure and wear resistance of laser melting deposited NiTi/Ni_3Ti intermetallic alloys Summary

Microstructure and wear resistance of laser melting deposited NiTi/Ni_3Ti intermetallic alloys

Article Summary   by:TsingHua     Original Author: China Nonferrous Metals
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The wear-resistant NiTi/Ni_3Ti intermetallic alloys were designed and fabricated by the laser melting deposition process.The as-solidified microstructures of the NiTi/Ni_3Ti intermetallic alloys were characterized by X-ray diffraction(XRD),optical microscope(OM),scanning electron microscope(SEM) and energy dispersive spectrometer(EDS).The wear resistance of the alloys was evaluated under room-temperature dry sliding wear test condition coupling with hardened bearing steel GCr15.The results indicate that the room temperature dry-sliding wear mechanism of the NiTi/Ni_3Ti intermetallic alloy with NiTi dendrite as the primary phase is soft abrasion and oxidative wear,while that of the NiTi/Ni_3Ti intermetallic alloy with Ni_3Ti as the primary phase is oxidative wear and microcutting under low/medium normal load,and micro-cutting is under high normal load;the NiTi/Ni_3Ti intermetallic alloy with NiTi dendrite as the primary phase has better wear resistance under dry sliding wear test conditions than that with Ni_3Ti as the primary phase.
Published: May 28, 2006   
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