Shop /Weight Handball Handball – 2 Sizes & 2 Weights Available. NEW. DISCONTINUED. Size:Gr. Free delivery and returns on all eligible orders. Matrix grain, leading to the grain refinement of the composite 17, 10. However, as shown in Fig. 4(d) and (e), when the content of SCFs is over 5 wt.%, clusters of SCFs. The CroswodSolver.com system found 25 answers for mountains which emit lava and gas crossword clue. Our system collect crossword clues from most populer crossword, cryptic puzzle, quick/small crossword that found in Daily Mail, Daily Telegraph, Daily Express, Daily Mirror, Herald-Sun, The Courier-Mail, Dominion Post and many others popular newspaper. The experiments in this work are conducted in a MTM–SLIM ball on disc test rig as shown in Fig. 1.In the normal operation of this rig, a 19.05-mm-diameter ball made of AISI 52100 (Ra = 0.02 μm) is loaded against a flat surface of a 46-mm-diameter steel disc or Al–Si disc (AISI 52100, Ra = 0.01 μm or A390, Ra = 0.05 μm) which is immersed in the oil sample.

Abstract:

This paper explores the wear characteristics of nanocrystalline Mg-5%Al-5%Nd, synthesized by mechanical alloying. Pin-on-disc unlubricated sliding wear tests were conducted against a hardened tool-steel counterface under loads of 10 and 30 N, and within a velocity range of 0.2-5.0 m/s. Despite its appreciably superior mechanical properties, the nanostructured alloy did not exhibit the expected improvement in wear resistance when compared to its conventional microngrain- sized counterpart; in fact, the former performed worse when testing conditions became more severe. Scanning electron microscopy (SEM) suggested that extensive delamination in the nanocrystalline alloy was the primary reason for its high wear rates. This wear mechanism was promoted by the presence of MgxNd dispersiods, which were found only within the nanocrystalline material. These compounds likely resulted from the long duration (20 hrs) of ball-milling, which was the mechanical alloying technique employed to reduce the grain size of the final alloy.

[1] E.O. Hall: Proc. Phys. Soc., London Vol. B64 (1951), p.747.

[2] N.J. Petch: J. Iron Steel Inst. Vol. 174 (1953), p.25.

[3] C. Suryanarayana: Int. Mater. Rev. Vol. 40 (1995), p.41.

[4] J.F. Archard: J. Appl. Phys. Vol. 24 (1953), p.981.

[5] Z.N. Farhat, Y. Ding, D.O. Northwood and A.T. Alpas: Mater. Sci. Eng. Vol. A206 (1996), p.302.

[6] L. Lu, K. Raviprasad and M.O. Lai: Mater. Sci. Eng. Vol. A368 (2004), p.117.

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[7] S. Guicciardi, C. Melandri, F. Lucchini and G. de Portu: Wear Vol. 252 (2002), p.1001.

[9] H. Chen and A.T. Alpas: Wear Vol. 246 (2000), p.106.

[10] S.C. Sharma, B. Anand and M. Krishna: Wear Vol. 241 (2000), p.33.

[11] J. Zhang and A.T. Alpas: Mater. Sci. Eng. Vol. A161 (1993), p.273.

[12] C.Y.H. Lim, S.C. Lim and M. Gupta: Wear Vol. 255 (2003), p.629.

[13] M. Takagi, H. Ohta, T. Imura, Y. Kawamura and A. Inoue: Scripta Mater. Vol. 44 (2001), p.2145.

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[14] M. Shanthi, C.Y.H. Lim and M. Gupta: J. Metastable Nanocrystalline Mater., in press.

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[15] Z.B. Wang, N.R. Tao, S. Li, W. Wang, G. Liu, J. Lu and K. Lu: Mater. Sci. Eng. Vol. A352 (2003), p.144.