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Key words£ºAu-Pt-Sn system; phase diagram; isothermal section; microstructure; phase equilibrium; spinodal decomposition

Õª    Òª£º²ÉÓà X ÉäÏßÑÜÉäÒÇ(XRD)ºÍµç×Ó̽ÕëÏÔ΢·ÖÎöÒÇ(EPMA)µÈ·½·¨²â¶¨ÁËAu-Pt-Sn ÈýԪϵ 700 ¡æµÈνØÃæ¡£½á¹û±íÃ÷£ºAu-Pt-Sn Ìåϵ 700 ¡æµÈνØÃæÓÉ3¸öµ¥ÏàÇø¡¢7¸öÁ½ÏàÇøºÍ6¸öÈýÏàÇø×é³É¡£6¸öÈýÏàÇø·Ö±ðΪPt3Sn+FCC-A1+PtSn¡¢PtSn+FCC-A1+Au5Sn¡¢PtSn+Pt3Sn+Au5Sn¡¢Pt3Sn+FCC-A1+Au5Sn¡¢PtSn+Pt2Sn3+LiquidºÍPtSn+FCC-A1+Liquid¡£Au-Pt-SnÌåϵÖдæÔÚAu-PtºÏ½ðµÄµ÷·ù·Ö½â·´Ó¦£¬Ëæ×ÅPtº¬Á¿µÄ¼õÉÙ£¬ºÏ½ðÖе÷·ù·Ö½âÏàÖð½¥Ïûʧ£¬ÔÚAu16Pt30Sn54ºÍAu16Pt20Sn64ºÏ½ðÖÐÍêÈ«Ïûʧ¡£ÓÉÓÚPt-SnºÏ½ðÏàµÄÈÛµã½ÏAu-SnºÏ½ðµÄÏà¸ß£¬ËùÒÔÔÚ700 ¡æµÈνØÃ棬´ó¶¼Ö»´æÔÚPt-SnºÏ½ðÏ࣬¶øAu-SnºÏ½ðÏà´ó¶¼Ö»´æÔÚÓÚÒºÏàÖС£ºÏ½ðAu16Pt69Sn15¡¢Au16Pt54Sn30ºÍAu16Pt42Sn42ÓÉÓÚ´æÔÚµ÷·ù·Ö½âÏ࣬×éÖ¯·Ö²¼½Ï¾ùÔÈ£¬ÆäÇ¿¶ÈÃ÷ÏԱȺϽðAu16Pt30Sn54ºÍAu16Pt20Sn64µÄ¸ß¡£

Abstract: The isothermal section of the Au-Pt-Sn ternary system at 700 ¡æ was investigated by X-ray diffractometer and electron probe microanalyzer. The results show that the isothermal section of the Au-Pt-Sn ternary system at 700 ¡æ is composed of three single-phase regions, seven two-phase regions and six three-phase regions. The six three-phase regions including Pt3Sn+FCC-A1+PtSn, PtSn+FCC-A1+Au5Sn, PtSn+Pt3Sn+Au5Sn, Pt3Sn+FCC-A1+Au5Sn, PtSn+Pt2Sn3+Liquid, PtSn+FCC-A1+Liquid. The spinodal decomposition reaction of Au-Pt alloy exists in the Au-Pt-Sn system. With decreasing Pt content, the spinodal decomposition phase in the alloy gradually disappears, and it completely disappears in Au16Pt30Sn54 and Au16Pt20Sn64 samples. Because the melting point of Pt-Sn alloy phase is higher than that of Au-Sn alloy, most of phases in 700 ¡æ isothermal section are Pt-Sn alloy, while Au-Sn alloy phase mainly exists in liquid phase. The microstructures distribution of Au16Pt69Sn15, Au16Pt54Sn30 and Au16Pt42Sn42 alloy are more uniform and the strengths of the alloy are higher than that of Au16Pt30Sn54 and Au16Pt20Sn64 alloy because of the existence of spinodal decomposition phase.

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