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Elasticity and Unelasticity of Intermetallic Compounds

金属间化合物的弹性和非弹性

基本信息

批准号：
01460213
负责人：
KOIWA Masahiro
金额：
$ 4.48万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

1. The Rectangular Parallelepiped Resonance (RPR) method has been known to be a powerful method for determining the elastic constants, but the amount of numerical calculations for the data analysis is quite large. A new method of analysis is proposed, which is applicable to the case of specimens of cubic crystals. In this method, the resonance frequencies are calculated and stored for various combinations of Poisson's ratio, nu and anisotropy factor. A. The measured spectrum of resonance frequencies is compared in turn with the calculated spectra by a procedure of something like pattern comparison so as to determine roughly the values of elastic constants. Final refinements can be done successfully by the interpolation of the stored data.2. The three elastic stiffness constants of various Ni-based intermetallic compounds Ni_3X (X=Mn, Fe, Al, Ga, Ge and Si) with L1_2 structure have been determined at room temperature by the rectangular parallelepiped resonance method. The elastic anisotropy factor, A, of the compounds is ge nerally large, ranging from 2.5 to 3.3, except for Ni_3Ge(A=1.71). The elastic constants exhibit some correlation with the lattice constants. The minor element, X, can be regarded as exerting "chemical pressure" which causes the expansion of the Ni lattice, thus resulting in the decreaseof the elastic constants.3. The self-diffusion coefficients of both the constituents (D _<Ni> and D_<Ge> in Ni_3Ge) have been first measured for L1_2 compounds. The relation of the self-diffusivities in the temperature range from 1173 to 1273 K is given as follows : 22< D _<Ni>/D_<Ge><29, where D is self-diffusion coefficient.

1.矩形六面体共振法(RPR)已被认为是确定弹性常数的一种强有力的方法，但数据分析的数值计算量相当大。提出了一种新的分析方法，适用于立方晶体的情况。在这种方法中，计算并存储了泊松比、nu和各向异性因子的各种组合的共振频率。答：通过类似模式比较的程序，依次将测量的共振频率谱与计算的谱进行比较，以粗略地确定弹性常数的值。通过对存储的数据进行内插，可以成功地完成最终的精化。用矩形六面体共振法在室温下测定了各种具有L12结构的镍基金属间化合物Ni3X(X=Mn，Fe，Al，Ga，Ge和Si)的三个弹性刚度常数。除了Ni_3Ge(A=1.71)外，其余化合物的弹性各向异性因子A都很大，在2.5~3.3之间。弹性常数与晶格常数之间存在一定的相关性。次要元素X可以认为是施加了“化学压力”，使Ni晶格膨胀，从而导致弹性常数降低。首次测量了L12化合物的D&lt；Ni&Gt；和D&lt；Ge&Gt；在Ni3Ge中的自扩散系数。在1173~1273K温度范围内，自扩散系数的关系式为：22&lt；D_&lt；Ni&gt；/D_&lt；Ge&gt；&lt；29，其中D为自扩散系数。