Fabrication of gradient-structure CuNiBe alloy bars by laser remelting and water-cooling

Tang, Danfeng; Li, Jing; Wang, Lin; Wang, Zhaofei; Kong, Charlie; Yu, Huimin

doi:10.1080/10426914.2020.1726948

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…Cu-Be alloys have won their popularity in aerospace, electronic communication, petrochemical, machinery and other fields owing to their excellent comprehensive properties [1][2][3], including outstanding mechanical properties, thermal/electrical conductivities, nonmagnetic performance and sparkless impact, etc [4][5][6]. The Be element can alleviate grain growth, delay solid solution decomposition and hinder grain boundary reaction during melt and heating treatment and hence plays a vital role for the properties of Cu-Be alloys [7].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and properties of ultrasonically surface-modified Cu–0.2Be–1.0Co alloy

Wang,

Zhang,

Hong

et al. 2023

Surface Engineering

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Low-Be copper alloys exhibit high thermal and electrical conductivities but weak strength, hardness, wear and corrosion resistances, which limit their practical applications severely. To overcome these defects, we herein systematically investigate the effects of ultrasonic surface modification on the microstructures and properties of Cu-0.2Be-1.0Co alloy. It is found that the gradient microstructures characterized by pile-ups and dents, fine grains, dense dislocations and compressive residual stresses are generated in the 171 μm thickness surface layer of the Cu-0.2Be-1.0Co alloy by ultrasonic surface modification. As a result, the surface hardness obtains a 162% enhancement, the wear rate drops from 5.03 × 10 −4 to 3.46 × 10 −4 mm 3 •N −1 •m −1 , and the electrochemical corrosion current density decreases from 3.24 to 1.92 μA/cm 2 . These results indicate that the comprehensive properties of Cu-0.2Be-1.0Co alloy can be simultaneously improved by utilizing ultrasonic surface modification.

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Section: Introductionmentioning

confidence: 99%

Microstructures and properties of ultrasonically surface-modified Cu–0.2Be–1.0Co alloy

Wang,

Zhang,

Hong

et al. 2023

Surface Engineering

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“…Nowadays, there are a few attempts to produce amorphous layers of different metals by laser processing technologies to improve the corrosion resistance and mechanical properties of the alloy, such as Ti-based, Fe-based, and Al-based amorphous alloys [27-32]. Zhang et al have prepared the Mg-Zn-Ca amorphous/crystalline composite layers by laser rapid melting, and the composite layer has excellent corrosion resistance [33].…”

Section: Introductionmentioning

confidence: 99%

Surface amorphization of Mg-Zn-Ca alloy by laser rapid melting for orthopaedic applications

Wang

Yang

Peng

et al. 2022

Surface Engineering

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The degradation rate of biodegradable Mg alloy is rapid due to the corrosive microdefects including precipitates and grain boundary, limiting its orthopaedic applications. Amorphous Mg alloy does not have these microdefects so low degradation rate, but its plasticity is poor. In this work, a laser rapid melting technique is proposed, which provides a large degree of undercooling to inhibit nucleation and growth, so the surface amorphization of the alloy is obtained to improve corrosion resistance without affecting plasticity. The results show that large quantities of amorphous phases are obtained at the scanning speed between 20 and 120 mm s −1 with the laser power between 80 and 120 W and the scanning passes of 1∼2 after laser rapid melting. The measured microhardness and corrosion rate are higher and 5-10 times slower than that of untreated Mg 60 Zn 35 Ca 5 alloy respectively, differences that are mainly attributed to the formation of an amorphous phase.

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“…Excellent thermal and electrical conductivities, corrosion resistance nature and extraordinary aesthetic appearance are unique features of copper (Cu) that attracts large number of applications in different sectors including households, shipbuilding, power, electrical, electronics and microelectronics, chemical, metallurgical automobile, manufacturing, petroleum, and nuclear [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Processing of copper by keyhole gas tungsten arc welding for uniformity of weld bead geometry

Darji

Badheka

Mehta

et al. 2020

Materials and Manufacturing Processes

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Keyhole gas tungsten arc welding (K-GTAW) was applied to characterize the weld bead geometry in case of the 6 mm thick electrolytic tough pitch copper. Various conditions of welding speeds and the preheating on the bead on geometry were studied for uniformity of weld geometry. Visual examination, macro bead dimensional analysis, microhardness profile across the transverse section, microstructural analyses were performed to investigate the K-GTAW on electrolytic tough pitch copper. The results revealed that full penetration of 6 mm can be obtained in a single pass using keyhole mode in GTAW. Keyhole length and width were majorly affected by the welding speed and preheating temperature. Significant variations in weld bead geometry were observed even when high heat input conditions were applied without preheating. Uniform weld bead geometry of 5 mm bead width and depth to width ratio of 0.42 was obtained for a length of 80 mm using appropriate preheating of 300°C and heat input condition of 1.37 kJ/mm (resulted from 300 amps welding current, 120 mm/min welding speed and 15.3 volts voltage). In the uniform weld bead geometry, the weld and heat affected zones were consisted of coarse grains relative to base material, wherein the micro hardness variations were observed.

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Fabrication of gradient-structure CuNiBe alloy bars by laser remelting and water-cooling

Cited by 5 publications

References 46 publications

Microstructures and properties of ultrasonically surface-modified Cu–0.2Be–1.0Co alloy

Microstructures and properties of ultrasonically surface-modified Cu–0.2Be–1.0Co alloy

Surface amorphization of Mg-Zn-Ca alloy by laser rapid melting for orthopaedic applications

Processing of copper by keyhole gas tungsten arc welding for uniformity of weld bead geometry

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