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Solid-state synthesis of new glassy Co65Ti20W15 alloy powders and subsequent densification into a fully dense bulk glass

Published online by Cambridge University Press:  03 March 2011

M. Sherif El-Eskandarany ,
M. Omori  and
A. Inoue
M. Sherif El-Eskandarany*
Affiliation:
Mining, Metallurgy and Petroleum Engineering Department, Faculty of Engineering, Al-Azhar University, Nasr City 11371 Cairo, Egypt
M. Omori
Affiliation:
Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University, Sendai 980-8577, Japan
A. Inoue
Affiliation:
Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The mechanical alloying method was used to synthesize a single glassy phase of Co65Ti20W15 alloy powders, using a high-energy ball mill. The glass transition temperature of the end-product, which was obtained after 173 ks of milling time, lies at 786 K, whereas the crystallization takes place at 878 K through a single sharp exothermic peak with an enthalpy change of crystallization of −4.37 kJ/mol. The reduced glass transition temperature was found to be 0.51. This glassy alloy powders exhibit a very large supercooled liquid region (92 K) for a ternary metallic system. The spark plasma sintering method was used to consolidate the glassy powders under an argon gas atmosphere at 843 K with a pressure of 19.6–38.2 MPa. The sample that was consolidated within 180 s maintains its chemically homogeneous glassy structure with a relative density of above 99.6%. Neither the supercooled liquid region nor crystallization temperature was affected by such a rapid consolidation procedure. Thus, the thermal stability of the bulk glassy sample is almost identical with the original glassy powders. The Vickers microhardness of the bulk glassy Co65Ti20W15 reveals high values, ranging between 8.69 and 8.83 GPa. The fabricated bulk glassy alloy shows high compressive strength of 2.44 GPa with a Young’s modulus of 176.81 GPa. Neither yielding stress, nor plastic strain could be detected for this glassy alloy, which its elastic strain is 1.33%.

Keywords

AlloyMechanical alloyingMetallic glasses
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 10 , October 2005 , pp. 2845 - 2853
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1Zhang, L.C., Xu, J. and Ma, E.: Mechanically alloyed amorphous Ti50(Cu0.45Ni0.55)44−xAlxSi4B2 alloys with supercooled liquid region. J. Mater. Res. 17, 1743 (2002).Google Scholar
2Liu, Y.J. and Chang, I.T.H.: The correlation of microstructural development and thermal stability of mechanically alloyed multicomponent Fe–Co–Ni–Zr–B alloys. Acta Mater. 50, 2747 (2002).CrossRefGoogle Scholar
3Seidel, M., Eckert, J., Bächer, I., Reibold, M. and Schultz, L.: Progress of solid-state reaction and glass formation in mechanically alloyed Zr65Al7.5Cu17.5Ni10. Acta Mater. 48, 3657 (2000).Google Scholar
4Kim, K.B., Yi, S., Kim, S.H., Kim, W.T. and Kim, D.H.: Structural evolution of the Ti70Ni15Al15 powders prepared by mechanical alloying. Mater. Sci. Eng. A 300, 148 (2001).Google Scholar
5Inoue, A. Applications, in Bulk Amorphous Alloys: Practical Characteristics and Applications, 1st ed., edited by Magini, M. and Wöhlbier, F.H. (Trans Tech Publications, Zurich, Switzerland, 1999), p. 140.Google Scholar
6El-Eskandarany, M. Sherif: Mechanical Alloying for Fabrication of Advanced Engineering Materials, 1st ed. (William Andrew Publishing, New York, NY, 2001), p. 5.Google Scholar
7Wang, W.H., Dong, C. and Shek, C.H.: Bulk metallic glasses. Mater. Sci. Eng. R44, 45 (2004).Google Scholar
8Koshiba, H. and Inoue, A.: Preparation and magnetic properties of Co-based bulk glassy alloys. Mater. Trans. JIM 42, 2572 (2001).Google Scholar
9Shen, B., Kimura, H., Inoue, A. and Mizushima, T.: Bulk glassy Fe–Ga–P–C–B alloys with high saturation magnetization and good soft magnetic properties synthesized by fluxing treatment and copper mold casting. Mater. Trans. JIM 42, 660 (2001).Google Scholar
10Shen, B., Kimura, H., Inoue, A., Omori, M. and Okubo, A.: Preparation of Fe65Co10Ga5P12C4B4 bulk glassy alloy with good soft magnetic properties by spark-plasma sintering of glassy powder. Mater. Trans. JIM 43, 1961 (2002).Google Scholar
11Ishihara, S., Zhang, W. and Inoue, A.: Hot pressing of Fe–Co–Nd– Dy–B glassy powders in supercooled liquid state and hard magnetic properties of the consolidated alloys. Scripta Metall. 47, 231 (2002).CrossRefGoogle Scholar
12El-Eskandarany, M. Sherif, Zhang, W. and Inoue, A.: Mechanically induced solid-state reaction for synthesizing of glassy Co75Ti25 soft magnet alloy powders with wide supercooled liquid region. J. Mater. Res. 17, 2447 (2002).Google Scholar
13Baolong, S. and Inoue, A.: Fabrication of large-size-Fe-based glassy cores with good soft magnetic properties by spark plasma sintering. J. Mater. Res. 18, 2115 (2003).Google Scholar
14Inoue, A. and Shen, B.: Soft magnetic properties of nanocrystalline Fe–Co–B–Si–Nb–Cu alloys in ribbon and bulk forms. J. Mater. Res. 18, 2799 (2003).Google Scholar
15Bednarčik, J., Kollár, X., Roth, S. and Eckert, J.: Co-based soft magnetic bulk amorphous ferromagnets prepared by powder consolidation. Phys. Status Solidi 199, 299 (2003).Google Scholar
16Ponnambalam, V., Poon, S. Joseph and Shiflet, J.: Fe-based bulk metallic glasses with diameter thickness larger than one centimeter. J. Mater. Res. 19, 1320 (2004).Google Scholar
17Kollár, P., Bednarčik, J., Roth, S., Grahl, H. and Eckert, J.: Structure and magnetic properties of hot pressed Co-based powder. J. Magn. Magn. Mater. 278, 373 (2004).Google Scholar
18El-Eskandarany, M. Sherif, Ishihara, S., Zhang, W. and Inoue, A.: Fabrication and characterizations of new glassy Co71Ti24B5 alloy powders and subsequent hot pressing into a fully dense bulk glass. Metall. Trans. 36A, 141 (2005).CrossRefGoogle Scholar
19Kawamura, Y., Shibata, T., Inoue, A. and Masumoto, T.: Superplastic deformation of Zr65Al10Ni10Cu15 metallic glass. Scripta Metall. 37, 431 (1997).CrossRefGoogle Scholar
20Inoue, A., Nishiyama, N. and Kimura, H.: Preparation and thermal stability of bulk amorphous Pd40Cu30Ni10P20 alloy cylinder of 72 mm in diameter. Mater. Trans. JIM 38, 179 (1997).Google Scholar
21El-Eskandarany, M. Sherif, Ishihara, S. and Inoue, A.: Mechanism of solid-state reaction for fabrication of new glassy V45Zr22Ni22Cu11 alloy powders and subsequent consolidation. J. Mater. Res. 18, 2435 (2003).Google Scholar
22El-Eskandarany, M. Sherif, Saida, J. and Inoue, A.: Structural and calorimetric evolutions of mechanically-induced solid-state devitrificated Zr70Ni25Al15 glassy alloy powder. Acta Mater. 51, 148 (2003).Google Scholar
23El-Eskandarany, M. Sherif, Saida, J. and Inoue, A.: Mechanically-induced devitrifications of ball-milled Zr70Pd20Ni10 glassy alloy powders. J. Mater. Res. 18, 250 (2003).CrossRefGoogle Scholar
24El-Eskandarany, M. Sherif, Saida, J. and Inoue, A.: Room-temperature mechanically induced solid state devitrifications of glassy Zr65Al 7.5Ni10Cu 12.5Pd 5 alloy powders. Acta Mater. 51, 4519 (2003).CrossRefGoogle Scholar
25Wang, S.W., Chen, L.D. and Hirai, T.: Densification of Al2O3 powder using spark plasma sintering. J. Mater. Res. 15, 982 (2000).CrossRefGoogle Scholar