| Thermodynamic assessment of Au-Zr system |
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| 作者姓名： | LI Zhi-hua |
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| 作者单位： | School of Materials Science and Engineering，Central South University，School of Materials Science and Engineering，Central South University，School of Materials Science and Engineering，Central South University Changsha 410083，China，Changsha 410083，China，Changsha 410083，China |
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| 基金项目： | TheNationalNaturalScienceFoundationofChina (No .5 98710 65 ) |
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| 摘 要： | 1 INTRODUCTIONChemicalvapordeposition (CVD)diamondholdsgreatpromiseinsolvingthermalmanagementprobleminhigh performancemulti chipmodules (MCMs) .However ,thismaterialdoespresentsometechnologi calchallenges ,onebeingthedevelopmentofreliablemetallizationsystems1] .Thedesirablecharacteristicsofametallizationsystemare goodadhesiontothesubstrate ,lowstress ,goodelectricalconductivityandminimalreactionsatsubsequentprocessingtempera tures (upto 4 0 0℃ ) 2 ] .Goldisusuallychosenasthemetalfor…
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| 收稿时间： | 22 May 2002 |
Thermodynamic assessment of Au-Zr system |
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| Li Zhi-hua , Jin Zhan-peng and Liu Hua-shan.Thermodynamic assessment of Au-Zr system[J].Journal of Central South University of Technology,2003,10(2):94-97. |
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| Authors: | Li Zhi-hua Jin Zhan-peng and Liu Hua-shan |
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| Affiliation: | (1) School of Materials Science and Engineering, Central South University, 410083 Changsha, China |
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| Abstract: | Au-Zr binary system was reassessed by using the calculation phase diagram (CALPHAD) technique based on experimental thermodynamic
data and newly reported phase diagrams. The excess Gibbs energies of the three terminal solutions and the liquid phases were
formulated with Redlich-Kister polynomial. All the intermetallic phases were treated as stoichiometric compounds with the
exception of ZrAu which is modeled by a two-sublattice model, (Au,Zr) : (Au,Zr). The results show that there exist seven intermetallics:
Zr3Au, Zr2Au, Zr5Au4, Zr7Au10, ZrAu2, ZrAu3, and ZrAu4 in the system. The eutectoid reaction: β(Zr) → α(Zr)+Zr3Au takes place at 1048 K and the maximal solubility of Au in α-Zr is 4.7% (mole fraction). The maximal solubility of Zr in Au is 6.0% (mole fraction) at 1347 K. The homogeneity range of
ZrAu phase is about 44.5%–52.9% (mole fraction) of Au. The present assessment fits experimental data very well.
Foundation item: The National Natural Science Foundation of China (No. 59871065)
Biography of the first author: LI Zhi-hua, born in Oct. 1975, majoring in materials science and engineering. |
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| Keywords: | Au-Zr system CALPHAD two-sublattice model |
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