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AGING PRECIPITATION OF Cu-Zr AND Cu-Zr-Si ALLOYS AND AFFECTED BY COLD WORKING

DONG Zhili TANG Xiangyun Tsinghua University , Beijing , ChinaHORI Sgigenori FUJITANI Wataru Faculty of Engineering , Osaka University , Japan DONG Zhili Dept.of Material Science and Engineering , Tsinghua University , Beijing 100084 , China

金属学报(英文版)

The hardness and electrical conductivity of Cu-Zr and Cu-Zr-Si alloys varying with differ- ent aging regimes were measured and the factors influencing the electrical conductivity were analysed.It is believed that a little Si can refine the precipitates and improve the resistance to softening.The improvement of materials properties by aging and the effect of cold work were also discussed.

关键词: aging , null , null

ACTIVITY OF In IN LIQUID In-Bi-Tl ALLOYS

ZHENG Minhui Univeristy of Science and Technology Beijing , Beijing , ChinaKOZUKA Zensaku Faculty of Engineering , Osaka University , Japan

金属学报(英文版)

The activities of In in two pseudo-binary systems of fixed molar fraction ratio N_(Bi)/N_(Ti) have been measured by means of EMF method using zirconia solid electrolyte gal- vanic cells over the temperature range of 973—1223 K.The excess free energies were deter- mined based on the experimental data.The experimentally determined thermodynamic prop- erties of the ternary alloys agree well with the values caleulated from the author's equations using related binary data.The excess free energies are negative in almost all compositions ex- cept those near the In-Tl side and become negatively larger as the compositions approach the Bi-Tl side.

关键词: In-Bi-Tl alloy , null , null , null

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