Accepted Manuscripts

Zeyi Guan, Injoo Hwang, Shuaihang Pan and Xiaochun Li
J. Micro Nano-Manuf   doi: 10.1115/1.4040558
Nanoparticle reinforced metals recently emerge as a new class of materials to empower the functionality of metallic materials. There is a remarkable success in self-incorporation of nanoparticles to bulk metals for extraordinary properties. There is also a strong demand to use nanoparticles to enhance the performance of metallic microwires for exciting opportunities in numerous applications. Here we show for the first time that silver-copper alloy (AgCu) reinforced by tungsten carbide (WC) (AgCu40 (wt. %)-WC) was manufactured by a stir casting method utilizing a nanoparticle self-dispersion mechanism. The nanocomposite microwires were successfully fabricated using thermal drawing method. By introducing WC nanoparticles into bulk AgCu40 alloy, the Vickers microhardness was enhanced by 63% with 22 vol. % WC nanoparticles, while the electrical conductivity dropped to 20.1% IACS. The microwires of AgCu40-10 vol. % WC offered an ultimate tensile strength (UTS) of 354MPa, an enhancement of 74% from the pure alloy, and an elongation of 5.2%. The scalable manufacturing method provides a new pathway for the production of metallic nanocomposite micro/nano wires with outstanding performance for widespread applications, e.g., in biomedical, brazing, and electronics industries.
TOPICS: Manufacturing, Nanocomposites, Nanoparticles, Alloys, Metals, Tensile strength, Tungsten, Electronics, Biomedicine, Information Analysis Centers, Nanowires, Electrical conductivity, Copper, Silver, Casting, Elongation, Microhardness, Brazing
Xi Zhang, Yuanyuan Shi, Benzheng Zhang and Chunying Si
J. Micro Nano-Manuf   doi: 10.1115/1.4040559
In order to inspect the condition of micro milling cutter automatically and accurately in the on-line process, a dedicated micro milling cutter condition inspection system was established in this paper, which can effectively inspect micro cutter condition from both radial and axial direction. The key methods---the automatic dimension measurement and the fusion method for compositing all-in-focus cutting edge image of micro milling cutters are studied. The experiments verify that the proposed methods and the developed inspection system can fulfill the needs of industrial applications.
TOPICS: Machinery, Inspection, Milling, Dimensions, Cutting

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