Evaluation of Cu-Zr-Ti-In Bulk Metallic Glasses via Nanoindentation
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JMEPEG (2013) 22:2288–2292 DOI: 10.1007/s11665-013-0519-x
Evaluation of Cu-Zr-Ti-In Bulk Metallic Glasses via Nanoindentation J.L. Wu, Y. Pan, and J.H. Pi (Submitted December 6, 2012; in revised form February 18, 2013; published online March 19, 2013) In this paper, the mechanical properties of two bulk metallic glasses, Cu60Zr34Ti5In1 and Cu58Zr34Ti5In3, have been evaluated by nanoindentation tests. The hardness and YoungÕs modulus of as-cast Cu60Zr34Ti5In1 bulk metallic glass increase from the center to the edge of the rod, but Cu58Zr34Ti5In3 shows an inverse trend. The YoungÕs modulus of Cu58Zr34Ti5In3 is lower than that of Cu60Zr34Ti5In1. For both bulk metallic glasses, serrations on the nanoindentation load-displacement curves depend not only on loading rate but also on the maximum load. Alternatively, the onset position of the appearance of serrations on the curves increases with the loading rate. In addition, the hardness of both samples decreases as the size of the indent increases due to indentation size effects.
Keywords
bulk metallic glass, hardness, nanoindentation test, YoungÕs modulus
1. Introduction Cu-based bulk metallic glasses have attracted increasing attention due to their integral performance, such as high strength and high elastic limit (Ref 1, 2). Up till now, an increasing number of studies on this alloy system have been carried out, such as design of compositions, improvement of mechanical properties, etc. Lin and Johnson (Ref 3) successfully fabricated Cu47Ti34Zr11Ni8 bulk metallic glasses with a critical size of 4 mm and Li et al. (Ref 4) reported Cu40Ti30Ni15Zr10Sn5 glassy alloy with a diameter of more than 2 mm. Nevertheless, It is worth noticing that the content of Cu in these two bulk metallic glasses is not more than 50 at.%. Interestingly, in 2001, Inoue et al. (Ref 1) prepared a series of Cu-based bulk metallic glasses containing more than 50 at.% Cu by alloying with Ti elements in Cu-Zr and Cu-Hf binary systems. In InoueÕs metallic glasses, Cu60Zr30Ti10 is the most attractive composition due to its very good glass-forming ability (Ref 5–7). In our previous work, we researched in the vicinity of the Cu60Zr30Ti10 composition, and developed one new composition, Cu61Zr34Ti5, which also has good glass-forming ability
Electronic supplementary material The online version of this article (doi:10.1007/s11665-013-0519-x) contains supplementary material, which is available to authorized users. J.L. Wu and Y. Pan, School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing 211189, Peoples Republic of China; and J.H. Pi, School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing 211189, PeopleÕs Republic of China; and School of Materials Engineering, Nanjing Institute of Technology, Nanjing 211189, PeopleÕs Republic of China. Contact e-mail: [email protected].
2288—Volume 22(8) August 2013
(Ref 8). For further investigation, In element was added a
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