The Composite Structure Affect on the Mechanical Properties of Ni-25Al-xFe Intermetallics

Ni-25Al-xFe介金屬合金複合結構對機械性質的影響

曹春暉(C. H. Tsau)

《華岡工程學報》 13期 (1999/06) Pp. 51-60

https://doi.org/10.29987/CCUHKJE.199906.0005

摘要

這篇研究主要在探討Ni-Al-Fe三元合金微結構變化與機械性質，目的在了解微結構的改變對機械性質之影響。研究結果顯示適量添加鐵元素可以改變NiAl介金屬化合物的微觀結構，將NiAl介金屬化合物原本單－β'-相結晶結構改變成多相樹枝狀複合結構。研究中顯示在拉伸實驗中主要的變形發生於微結構中樹枝間的γ-相，也因此使得合金具有較好的拉抻性質。而室溫拉伸性質的改變可以成功的以平面應力模式及平面應變模式理論加以解釋之。

並列摘要

The present work investigated the microstructural evolution and mechanical properties of ternary Ni-Al-Fe alloys which are the NiAl system macroalloyed with iron. The aim is to get an understanding of the relationship between the microstructures and the mechanical properties. The results reveal that the suitable additions of Fe can change the NiAl from a single β'-phase granular structure to a multi-phased dendritic one. Because the major plastic deformation was supported by the γ-phase in the interdendrite, the alloys with such a microstructure could possess better mechanical properties. The variation of the room- temperature tensile properties with Fe-content could be successfully explained by considering the conditions of plain strain or plain stress.