Developments of Bulk Plate of Amorphous Alloy Ribbons and Its Reliability Analysis

由于高强度和电磁材料的特性，各种非晶态合金被开发出来并应用于机械领域。强度分布方面在评估机械结构的安全性和可靠性方面起着重要作用。实验研究了铁基非晶合金薄带的拉伸性能和疲劳性能的分布特征。得到的主要结论如下：(1)从RT到300℃温度范围内抗拉强度的分布情况。C服从具有三个参数的维布尔型布居分布。(2)400℃开始晶化，500℃完成晶化。由于晶化，400℃的拉伸强度具有明显的分散性，并用组合分布的概念很好地解释了这种分布特征。(3)建立了多层复合板的制备工艺，使板的强度由每层非晶带的强度积分而得到。(4)发现脉动拉伸疲劳性能具有明显的分散性。因此，在机械设计和安全分析中应引入统计程序。

Various kinds of amorphous alloys were developed and applied to the mechanical use due to the high strength as well as the electro-magnetic materials. Distribution aspect of the strength plays an important role in evaluation of the safety and reliability of the mechanical structures. In this study, distribution characteristics of tensile and fatigue properties of Fe base amorphous alloy ribbons were experimentally examined. Main conclusions obtained are summarized as follows ;(1) Distribution aspect of tensile strength at temperatures from RT to 300deg. C is governed by a common population distribution of Wiebull type having three parameters.(2) Crystalization begins to occur at 400deg.C and completed at 500deg.C.Tensile strength at 400deg.C has a distinct scatter due to the crystalization and the distribution characteristics are well explained by means of a concept of combined distribution.(3) Fabrication process of multi-plied composite plate was established such that the strength of the plate was given by integration of the strength for each ply of the amorphous ribbons.(4) It was found that the fatigue property in pulsating tension had a distinct scatter. Thus statistical procedure should be introduced to the machine design and the safety analysis.