Study of Fatigue and Fracture Behavior of Cr-Based Alloys and Intermetallic Materials: Effects of Processing on the Microstructure and Mechanical Behavior of Binary Cr-Ta Alloys.

He, Y. H. ; Lu, Y. ; Wang, D. F. ; Liaw, P. K. ; Liu, C. T. ; Heatherley, L. ; George, E. P.

Technical Information Center Oak Ridge Tennessee

关键词: Chromium alloys;    Intermetallics;    Mechanical properties;    Fatigue;    Fracture mechanics;   

RP-ID  :  DE2001777677

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The microhardness and tensile and fracture-toughness properties of drop-cast and directionally-solidified Cr-9.25 atomic percent Ta alloys have been investigated. Directional solidification was found to soften the alloy which could be related to the development of equilibrium and aligned microstructures. It was observed that the tensile properties of the Cr-Ta alloys at room and elevated temperatures could be improved by obtaining aligned microstructures. The directionally-solidified alloy also showed increased fracture toughness at room temperature. This trend is mainly associated with crack deflection and the formation of shear ribs in the samples with aligned microstructures. The sample with better-aligned lamellar exhibits greater fracture toughness.