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随着测试技术的发展,样品的用量越来越少,如在相图研究的重要手段——热分析中,样品的数量仅为1×10~(-3)克。因而如何使1×10~(-3)克数量级的样品的化学成分能代表合金的整体,是相图研究工作者的一个问题。传统的研究方法中(铸锭、加工、取样程序)铸锭的偏析和加工的污染,无疑使微量样品难以达到要求。快速溅淬工艺能使合金从化学成分均匀的液态急速凝固成型,只经过熔炼与溅淬两步即可获得较为理想的样品,在研究AgCuIn三元合金中证明此法的可靠性。现以AgCu_(26)In_(10)合金为例,采用不同方法制备样品,进行金相及示差热分析比较。
With the development of testing technology, the amount of sample used is getting less and less. For example, in thermal analysis, the quantity of sample is only 1 × 10 ~ (-3) g. Therefore, how to make the chemical composition of a sample of the order of 1 × 10 -3 g can represent the whole alloy is a problem for phase diagram researchers. Traditional research methods (ingot, processing, sampling procedures) segregation of ingot and processing pollution, no doubt make the trace sample difficult to meet the requirements. The rapid splashing process makes the alloy rapid solidification from a liquid with a uniform chemical composition. The ideal sample can be obtained only after two steps of melting and splashing. The reliability of this method is proved in the study of AgCuIn ternary alloy. Taking AgCu_ (26) In_ (10) alloy as an example, different methods were used to prepare the samples for metallographic and differential thermal analysis.