研究了3种不同凝固方法制备的精密电阻PdW20合金铸态组织结构，扫描电镜和电子探针分析表明：采用特殊凝固方法制备的合金铸锭避免了常规水冷铜模方法制备铸锭出现的穿晶组织和铸锭晶界间存在的微裂纹，改善了合金的加工性能；同时避免了定向凝固方法造成的铸锭头尾成分不均匀性的缺陷。讨论了合金短程有序(K效应)与组织、性能的关系。
The cast structures of precision resistor PdW20 alloy prepared using three different solidification methods were studied. The scanning electron microscopy and electron probe microanalyses (EPMA) showed that the workability of PdW20 alloys prepared by the special solidification method was improved. By using the method the trans-crystallization structure and microcracks among grain boundary produced from water-cooled copper mold could be suppressed, and at the same time it could avoid the defects of different composition in ingot head and end prepared by the directional solidification method. The relationship between the structure and properties of PdW20 alloy with the short-range ordering (K-effect) was discussed.
参考文献
| [1] | 张书仁;刘立余;徐正芳 .PdW20合金的制备工艺及其性能研究[J].仪表材料,1982,13(02):54. |
| [2] | <贵金属加工手册>编写组.贵金属材料加工手册[M].北京:冶金工业出版社,1978:180-181. |
| [3] | 刘立余 .PdW20合金的 K 效应[J].贵金属,1986,7(03):17-21. |
| [4] | 黄炳醒 .凝固传热对 PdW20合金铸锭组织结构的影响[R].昆明:昆明贵金属研究所,2002. |
| [5] | Darling A S .Potentiometer slidewire materials[J].Plati- num Metals Review,1968,12(02):54-61. |
| [6] | 陈亮维,黄炳醒,刘雄,马丽华.Pd-20W合金固溶体的结构分析[J].贵金属,2002(02):33-37. |
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