Production and Characterization of Brass-matrix Composites Reinforced with Ni59Zr20Ti16Si2Sn3 Glassy Particles

Metals

Jin Young Kim²  Sergio Scudino²  Uta Kühn²  Bum Sung Kim¹  Min Ha Lee¹ 

[1] Advanced Materials Division, Korea Institute of Industrial Technology, Incheon 406-840, Korea;IFW Dresden, Institut für Komplexe Materialien, Postfach 270116, Dresden D-01171, Germany;

关键词: composites;    metallic glasses;    powder metallurgy;    mechanical properties;   

DOI  :  10.3390/met2020079

来源: mdpi

【 摘 要 】

Brass-matrix composites reinforced with 40 and 60 vol.% of Ni₅₉Zr₂₀Ti₁₆Si₂Sn₃ glassy particles were produced by powder metallurgy. The crystallization behavior and the temperature dependence of the viscosity of the glass reinforcement were studied in detail to select the proper sintering parameters in order to avoid crystallization of the glassy phase during consolidation. The brass-glass powder mixtures were prepared through manual blending as well as by ball milling to analyze the effect of the matrix ligament size on the mechanical properties of the composites. The powder mixtures were then consolidated into highly-dense bulk specimens at temperatures within the supercooled liquid region by hot pressing followed by hot extrusion. The preparation of the powder mixtures has a strong influence on the mechanical behavior of the composites. The strength increases from 500 MPa for pure brass to 740 and 925 MPa for the blended composites with 40 and 60vol.% of glass reinforcement, while the strength increases to 1,240 and 1,640 MPa for the corresponding composites produced by ball milling. Modeling of the mechanical properties indicates that this behavior is related to the reduced matrix ligament size characterizing the milled composites.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.