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As used herein, a refractory material is a metal or an alloy having a high melting temperature, for example, greater than about 1750??? C. Examples of refractory materials include metals, such as niobium, zirconium, hafnium, molybdenum, osmium, iridium, tantalum, tungsten, titanium, rhenium, and alloys including the metals, such as Ti-6Al-4V, Ti-50Ta, Ti-10Ir, and Nb-1Zr.
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