Bulk Glassy Alloys with Low Liquidus Temperature in Pt-Cu-P System
Bulk Glassy Alloys with Low Liquidus Temperature in Pt-Cu-P System
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DOI：
10.2320/matertrans.44.1143
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发表时间：
2003-06
影响因子：
1.2
通讯作者：
Tao Zhang;A. Inoue
中科院分区：
文献类型：
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作者：
Tao Zhang;A. Inoue
在Pt60Cu20P20上形成了低的液相线温度(T1)和玻璃化转变温度(Tg)以及高的Tg/T1的块体非晶合金。在Pt80-xCuxP20系统中，在整个成分范围内形成了玻璃合金，最高可达35at%。Tg随铜含量的增加而显著增加，在铜含量为20%时出现最大值522K，然后随铜含量的增加略有下降。另一方面，晶化温度(Tx)随着铜含量的增加而单调增加，当铜含量达到25at%时达到饱和，导致Δ的Tx(=Tx-Tg)从25K单调增加到35at%Cu时的83K。所有三元非晶合金的晶化过程均为一步放热反应，并伴随有Pt5P2、Cu3P和未知相的混合析出。含铜2 0%合金的T1最低，为85 4K，T1与熔化温度(Tm)之间的温度间隔最小，为2 1K，从而获得了最高的Tg/T1，为0.6 1。高T_g/T_1和低T_1使我们能够通过水淬火形成直径至少12毫米的块状玻璃合金棒。低玻璃化温度(Tg)、低转变温度(T1)和大Δ转变温度(Tx)的铂-铜-磷玻璃合金的合成是纳米技术精密材料未来发展的重要方向。
Bulk glassy alloys with low values of liquidus temperature (T 1 ) and glass transition temperature (Tg) as well as high T g /T 1 were formed at Pt 60 Cu 20 P 20 . Glassy alloys in Pt 80-x Cu x P 20 system were formed over the whole composition range up to 35 at%Cu examined in the present study. The T g increases significantly with increasing Cu content, shows a maximum value of 522 K at 20%Cu and then decreases slightly with further increase in Cu content. On the other hand, the crystallization temperature (T x ) increases monotonously with increasing Cu content up to 25 at%Cu and then becomes saturated, leading to a monotonous increase in ΔT x (=T x -T g ) from 25 K at 0%Cu to 83 K at 35 at%Cu. All the ternary glassy alloys crystallize through a single-stage exothermic reaction, accompanied by the precipitation of mixed Pt 5 P 2 , Cu 3 P and unknown phases. The 20%Cu-containing alloy has the lowest T 1 of 854 K as well as the smallest temperature interval of 21 K between T 1 and melting temperature (T m ) and hence the highest T g /T 1 of 0.61 is obtained for the 20%Cu alloy. The high T g /T 1 as well as the low T 1 has enabled us to form bulk glassy alloy rods with diameters up to at least 12 mm by water quenching. The synthesis of the Pt-Cu-P glassy alloys with the low values of T g and T 1 and the large ΔT x is important for future development as precision materials for nano-technology which can be deformed through viscous flow.