Effect of Ternary Alloying Elements on Microstructure and Mechanical Property of Nb-Si Based Refractory Intermetallic Alloy

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Microstructure and mechanical property at room temperature and at 1773 K of Nb-Si based refractory intermetallic alloys were investigated in terms of compression and fracture toughness test. Mo and V were chosen as ternary alloying elements because of their high melting points, atomic sizes smaller than Nb. Both ternary alloying elements were found to have a significant role in modifying the microstructure from dispersed structure to eutectic-like structure in Nb solid solution/Nb5Si3 intermetallic composites. The 0.2% offset yield strength at room temperature increased with increasing content of ternary elements in Nb solid solution and volume fraction of Nb5Si3. At 1773 K, Mo addition has a positive role in increasing the yield strength. On the other hand, V addition has a role in decreasing the yield strength. The fracture toughness of ternary alloys was superior to binary alloys. Details will be discussed in correlation with ternary alloying, volume fraction of constituent phase, and the microstructure.

Info:

Periodical:

Materials Science Forum (Volumes 486-487)

Edited by:

Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee

Pages:

342-345

Citation:

W. Y. Kim et al., "Effect of Ternary Alloying Elements on Microstructure and Mechanical Property of Nb-Si Based Refractory Intermetallic Alloy", Materials Science Forum, Vols. 486-487, pp. 342-345, 2005

Online since:

June 2005

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Price:

$38.00

[1] Won-Yong Kim, Hisao Tanaka and Shuji Hanada, Intermetallics, Vol. 10 (2002), pp.625-634.

[2] Won-Yong Kim, Hisao Tanaka, Akio Kasama and Shuji Hanada, Intermetallics, Vol. 9 (2001), p.827. Fig. 5. Room temperature fracture toughness plotted as a function of the content of ternary alloying element in Nb-18Si-xMo or xV alloys.

DOI: https://doi.org/10.1016/s0966-9795(01)00072-3

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