Processing Zr_52.5Cu_17.9Ni_14.6Al₁₀Ti₅ metallic glass containing high levels of oxygen by microalloying with erbium

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• 作者：J.J. Wall ; C. Fan ; P.K. Liaw ; H. Choo
• 关键词：Metallic glass ; Glassy composite ; Glass stabilization ; BMG processing
• 刊名：Materials Science and Engineering: A
• 出版年：2008
• 出版时间：15 January 2008
• 年：2008
• 卷：472
• 期：1-2
• 页码：125-129
• 全文大小：476 K

文摘

Zr_52.5Cu_17.9Ni_14.6Al₁₀Ti₅ was doped with oxygen and erbium to determine the effect of impurity oxygen and microalloying on the stability of the liquid during processing from the melt. It was established that oxygen concentrations of 5000–14,000 ppm (atomic herein) destabilized the alloy significantly, consistent with data trends seen in the literature. The oxygen containing materials crystallized into tetragonal and cubic intermetallics during processing. The highest levels of oxygen facilitated complete transformation to the cubic structure. The addition of 0–1 at. % rare-earth Er to the impure materials stabilized the liquid by the formation of anticatalyst (Er, Al)₂O₃ dispersions, allowing the production of glassy matrix composites in the form of 6.4 mm diameter × 70 mm rods with oxygen contents up to 16,000 ppm. Compression testing of the Er-doped samples showed that their rupture strengths varied little with Er/O content.