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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.

DE2001777677

Publication Date	2001
Personal Author	He, Y. H.; Lu, Y.; Wang, D. F.; Liaw, P. K.; Liu, C. T.; Heatherley, L.; George, E. P.
Page Count	24
Abstract	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.
Keywords	Chromium alloys Intermetallics Mechanical properties Fatigue Fracture mechanics Tantalum alloys Microhardness Tensile properties Fracture properties
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Oak Ridge National Lab., TN.; Tennessee Univ., Knoxville. Dept. of Materials Science and Engineering.; Department of Energy, Oak Ridge, TN. Advanced Research and Technology
Supplemental Notes	Prepared in cooperation with Tennessee Univ., Knoxville. Dept. of Materials Science and Engineering. Sponsored by Department of Energy, Oak Ridge, TN. Advanced Research and Technology Fossil Energy Materials Program.
Document Type	Technical Report
NTIS Issue Number	200120

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.

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.
DE2001777677

Publication Date	2001
Personal Author	He, Y. H.; Lu, Y.; Wang, D. F.; Liaw, P. K.; Liu, C. T.; Heatherley, L.; George, E. P.
Page Count	24
Abstract	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.
Keywords	Chromium alloys Intermetallics Mechanical properties Fatigue Fracture mechanics Tantalum alloys Microhardness Tensile properties Fracture properties
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Oak Ridge National Lab., TN.; Tennessee Univ., Knoxville. Dept. of Materials Science and Engineering.; Department of Energy, Oak Ridge, TN. Advanced Research and Technology
Supplemental Notes	Prepared in cooperation with Tennessee Univ., Knoxville. Dept. of Materials Science and Engineering. Sponsored by Department of Energy, Oak Ridge, TN. Advanced Research and Technology Fossil Energy Materials Program.
Document Type	Technical Report
NTIS Issue Number	200120