The microstructure, microhardness and tensile properties of laser additive manufactured (LAM) Ti?5Al?2Sn?2Zr?4Mo?4Cr alloy were investigated. The result shows that the microstructure evolution is strongly affected by ...The microstructure, microhardness and tensile properties of laser additive manufactured (LAM) Ti?5Al?2Sn?2Zr?4Mo?4Cr alloy were investigated. The result shows that the microstructure evolution is strongly affected by the thermal history of LAM process. Primary α (αp) with different morphologies, secondary α (αs) and martensite α' can be observed at different positions of the LAMed specimen. Annealing treatment can promote the precipitation of rib-like α phase or acicular α phase. As a result, it can increase or decrease the microhardness. The as-deposited L-direction and T-direction specimens contain the same phase constituent with different morphologies. The tensile properties of the as-deposited LAMed specimens are characterized of anisotropy. The L-direction specimen shows the character of low strength but high ductility when compared with the T-direction specimen. After annealing treatment, the strength of L-direction specimen increases significantly while the ductility reduces. The strength of the annealed T-direction specimen changes little, however, the ductility reduces nearly by 50%.展开更多
The basic interest of this text is certain aspects in the relation between literature, history, and memory. Particullary, this relation has been examined through the prism of subverting the traditionally established d...The basic interest of this text is certain aspects in the relation between literature, history, and memory. Particullary, this relation has been examined through the prism of subverting the traditionally established distinction between history and literature, in which certain types of memory have its own contribution. The main focus, for that purpose, is based on the concepts ofpostmemory, secondary memory, apocryphal history, creative anachronism and figures of memory, and their applicative capacities concerning particular theme fields which express common interest both for history and literature展开更多
基金Projects(51105311,51475380)supported by the National Natural Science Foundation of ChinaProject(2013AA031103)supported by the National High-Tech Research and Development Program of China
文摘The microstructure, microhardness and tensile properties of laser additive manufactured (LAM) Ti?5Al?2Sn?2Zr?4Mo?4Cr alloy were investigated. The result shows that the microstructure evolution is strongly affected by the thermal history of LAM process. Primary α (αp) with different morphologies, secondary α (αs) and martensite α' can be observed at different positions of the LAMed specimen. Annealing treatment can promote the precipitation of rib-like α phase or acicular α phase. As a result, it can increase or decrease the microhardness. The as-deposited L-direction and T-direction specimens contain the same phase constituent with different morphologies. The tensile properties of the as-deposited LAMed specimens are characterized of anisotropy. The L-direction specimen shows the character of low strength but high ductility when compared with the T-direction specimen. After annealing treatment, the strength of L-direction specimen increases significantly while the ductility reduces. The strength of the annealed T-direction specimen changes little, however, the ductility reduces nearly by 50%.
文摘The basic interest of this text is certain aspects in the relation between literature, history, and memory. Particullary, this relation has been examined through the prism of subverting the traditionally established distinction between history and literature, in which certain types of memory have its own contribution. The main focus, for that purpose, is based on the concepts ofpostmemory, secondary memory, apocryphal history, creative anachronism and figures of memory, and their applicative capacities concerning particular theme fields which express common interest both for history and literature
