一引言一種新的鑄造合金,自發現以至大規模應用的發展過程,可分為三個階段:第一階段為試驗室階段。最初在試驗室中第一次發現某種新的合金,或已有合金的改良型,具有某种特出的性能,於是冶金工程師集中力量研究如何使此一結果得以任意重複获得、如何簡化製造手續、及進一步改良其性能。在研究結果足以證明此種具有新性能之合金可以任意複製,且每次製成后 I. INTRODUCTION A new casting alloy, from the discovery to the development of large-scale applications, can be divided into three stages: The first stage is the laboratory stage. The first time a new alloy was discovered in the laboratory, or an improved version of the existing alloy, had some outstanding performance. Metallurgical engineers focused their efforts on how to make this result arbitrarily repeated, and how to simplify manufacturing. Procedures, and further improve its performance. The results of the study are sufficient to prove that this alloy with new properties can be arbitrarily replicated and