Effect of Nb addition on the glass forming ability and mechanical properties in the Ni-Zr-Al-Hf-Nb alloys

W. B. Kim, B. J. Ye, S. Yi

Research output: Contribution to journalArticlepeer-review

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Abstract

The effect of substituting Nb for Zr on the glass forming ability (GFA) and mechanical properties of Ni60 $$(\rm Zr)_(27-x)$$ Al6Hf7 $$(\rm Nb)_(x)$$ (x = 0 - 14) alloys was investigated. The substitution of Zr with Nb of 0 - 14 at% improved the GFA. When increasing the Nb content x from 0 - 14, the glass transition temperature, T g , and the crystallization temperature, $$(\rm T)_x$$ , of melt-spun Ni60 $$(\rm Zr)_(27-x)$$ Al6Hf7 $$(\rm Nb)_x$$ (x = 0 - 14) alloys increased from 833 and 863K to 877 and 914 K, respectively. The Ni60 $$(\rm Zr)_(27-x)$$ Al 6Hf7 $$(\rm Nb)_x$$ (x = 8, 10, 12 and 14) alloys exhibited high $$T_(rg)\, (((( = T_(g))/(T_( m)\,^(( liq))))))$$ (>0.615), $$\gamma (((( = T_(\rm x)) / T_(\rm g) + T_(\rm m)^((\rm liq)))))$$ (>0.4) values and a wide supercooled liquid region, $$\Delta T_x$$ (= $$T_x$$ - T g ) (>36K) enabling the fabrication of bulk metallic glass (BMG) with a diameter above 1mm. As such, Ni60Zr17Al6Hf 7Nb10 and Ni60Zr15Al 6Hf7Nb12 alloys with a maximum diameter of 2 mm could be fabricated by injection casting. These bulk amorphous alloys also exhibited good mechanical properties, where the true ultimate compressive strength, strain and Vickers hardness (Hv) were approximately 3.0GPa, 2.08% and 713, respectively, for the amorphous Ni60Zr 17Al6Hf7Nb10 alloy, and 3.1GPa, 2.22% and 687, respectively, for the amorphous Ni60Zr 15Al6Hf7Nb12 alloy.

Original languageEnglish
Pages (from-to)3805-3809
Number of pages5
JournalJournal of Materials Science
Volume41
Issue number12
DOIs
StatePublished - Jun 2006

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