SIMULATING THE EFFECT OF POISSON RATIO ON METALLIC GLASS PROPERTIES

摘要：

Recent work has shown that many metallic glass properties correlate with the Poisson ratio of the glass. We have developed a new model for simulating the atomistic behavior of liquids and glasses that allows us to change the Poisson ratio, while keeping the crystalline phase cohesive energy, lattice constant, and bulk modulus fixed. A number of liquid and glass properties are shown to be directly affected by the Poisson ratio. An increasing Poisson ratio stabilizes the liquid structure relative to the crystal phase, as indicated by a significantly lower melting temperature and by a lower enthalpy of the liquid phase. The liquids clearly exhibit two changes in behavior: one at low temperatures, associated with the conventional glass transition Tg, and a second, higher temperature change associated with the shear properties of the liquids. This second crossover has a characteristic, measurable change in the liquid structure.

关键词： Metallic glass Poisson ratio molecular dynamics

作者: JAMES R.MORRIS RACHEL S.AGA TAKESHI EGAMI VALENTIN A.LEVASHOV

作者单位: MS&T Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115 University of Tennesse MS&T Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115 Department of Chemistr University of Tennessee, Knoxville, Tennessee 37996

会议类型: 国际会议

会议名称: 第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)

会议地点: 哈尔滨

会议语种:英文

页码: 1229-1234

在线出版日期: 2008-09-03（万方平台首次上网日期，不代表论文的发表时间）