|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Characteristics of Ideal Cluster Formulas for Zr-based Bulk Metallic Glasses
||Kaiming Han, Jianbing Qiang, Yingmin Wang, Qing Wang, Chuang Dong
|On-Site Speaker (Planned)
It is known typical bulk metallic glasses (BMGs) can be interpreted by single cluster formula. In the present work, the unique characteristics of the ideal cluster formulas for good glass formers are uncovered by interpreting several typical Zr-based BMGs with super high glass forming ability (GFA). The compositions of good glass formers were explained by dual-cluster formulas, [cluster<SUB>α</SUB> + cluster<SUB>β</SUB>](glue atoms)<SUB>2,4,6</SUB>, where the each cluster formula [cluster](glue atoms)<SUB>1 or 3</SUB> is derived from the eutectic cluster of explaining relevant eutectic points. Moreover, the number of valence electrons per unit formula is at least one close to 24. Zr<SUB>62.5</SUB>Al<SUB>9.4</SUB>Fe<SUB>4.7</SUB>Cu<SUB>23.4</SUB> BMG alloy was designed by a dual-cluster formula [Zr-Cu<SUB>4</SUB>Zr<SUB>9</SUB>+Al-Zr<SUB>9</SUB>Al<SUB>2</SUB>]Cu<SUB>3</SUB>Al<SUB>3</SUB>, which exhibits large critical glass formation size (d<SUB>max</SUB>=8 mm), high tensile strength of 1520 ± 18 MPa, large room-temperature compressive plasticity (ɛ<SUB>P</SUB> = 6.5%), high fracture toughness of 86 ± 12 MPa m<SUP>1/2</SUP> and better corrosion resistance.
||Planned: Supplemental Proceedings volume