Title :
First-principles study on the elastic anisotropy of Au-Sn intermetallic compounds
Author :
An, Rong ; Wang, Chunqing ; Tian, Yanhong
Author_Institution :
Dept. of Electron. Packaging Technol., Harbin Inst. of Technol., Harbin
Abstract :
Independent elastic constants of single-crystal Au5Sn and AuSn were determined through first-principles calculations to characterize their elastic anisotropy. The ideal elastic moduli and Poissonpsilas ratio of Au5Sn were determined using the Voigt-Reuss-Hill method and were very close to the range of experimental results; but the ideal Youngpsilas modulus of AuSn was much smaller than the experimentally obtained values. This unusual discrepancy in the Youngpsilas modulus values of AuSn is probably attributed to its extraordinarily high anisotropy in Youngpsilas modulus with a 95 GPa difference between its maximum and minimum values. Au5Sn exhibits relatively low anisotropy in Youngpsilas modulus with the maximum-minimum difference of 38 GPa.
Keywords :
Poisson ratio; Young´s modulus; gold alloys; solders; tin alloys; Au-Sn intermetallic compounds; Au5Sn; Poissonpsilas ratio; Voigt-Reuss-Hill method; Youngpsilas modulus; elastic anisotropy; elastic constants; elastic moduli; first-principles calculations; maximum-minimum difference; pressure 95 GPa; Anisotropic magnetoresistance; Crystallization; Electronic packaging thermal management; Intermetallic; Lattices; Materials science and technology; Mechanical factors; Soldering; Thermal conductivity; Thermal resistance;
Conference_Titel :
Electronic Packaging Technology & High Density Packaging, 2008. ICEPT-HDP 2008. International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-2739-0
Electronic_ISBN :
978-1-4244-2740-6
DOI :
10.1109/ICEPT.2008.4606995
