Enhancement of the Thermal Stability and Mechanical Hardness of Zr-Al-Co Amorphous Alloys by Ag Addition
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ODUCTION
BULK amorphous alloys have attracted worldwide interest since the syntheses of bulk amorphous alloys in multicomponent via the copper mold casting method in 1988.[1] Considerable effort has been expended to develop new bulk amorphous alloys that possess high stability and useful engineering properties.[2–10] Subsequently, bulk amorphous alloy systems have been widely extended to various-based alloys. Among the bulk glassy alloy systems, the Zr-based alloys exhibit high glass form ability (GFA) and high mechanical strength combined with high ductility; hence, these alloys have attracted much interest as a new type of bulk structural materials. Inoue et al.[11] developed Zr-Al-Co-based bulk glassy alloy system. This ternary Zr-based glassy alloy has several excellent features that are not present in quaternary and five Zr-based bulk glassy alloys. The element doping method is widely used in discovering new bulk glass-forming alloys and improving alloy properties.[12] Previous studies found that adding
YONGYONG WANG, Associate Professor, is with the College of Physics and Electronic Engineering, and Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, P. R. China, and also with the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004. Contact e-mail: [email protected] XIAO DONG, XIAOHUI SONG, and JINFENG WANG, Associate Professors, are with the College of Physics and Electronic Engineering, and Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007. GONG LI, Professor, is with the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, and also with the Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN37996. Contact e-mail:gli25@ utk.edu RIPING LIU, Professor, is with the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University. Manuscript submitted September 17, 2015. Article published online February 18, 2016 METALLURGICAL AND MATERIALS TRANSACTIONS A
appropriate amount of Ag can enhance the GFA and corrosion resistance, as well as the plasticity of the Zr-Al-Co-based bulk glassy alloys.[13,14] However, the mechanism of the effects of Ag addition on the thermal and mechanical properties of Zr-based glass remains unclear. This paper aims to examine the effects of Ag addition on the thermal and mechanical properties of Zr57Al15Co28 amorphous alloys and reveal the mechanism of Ag addition. The samples were produced by melt spinning. Differential scanning calorimetry (DSC), in situ high-pressure angle dispersive X-ray diffraction (ADXRD), and nanoindentation were employed for analyses. The diffraction data in reciprocal space and the atomic pair distribution function (PDF) g(r) in real space were also analyzed.
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EXPERIMENTS
Alloy ingots were prepared by arc melting the mixtures of pure Zr (99.9 pct), Al (99.9 pct), Co (99.999 pct), and Ag (99.99 pct) in a Ti-gettered argon atmosphere
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