The influence of oxygen content on the microstructure and mechanical properties of Ti-23Nb-0.7Ta-2Zr （at%） alloy in as-cast and cold-rolled states was investigated systematically in this paper. It is found that the ...The influence of oxygen content on the microstructure and mechanical properties of Ti-23Nb-0.7Ta-2Zr （at%） alloy in as-cast and cold-rolled states was investigated systematically in this paper. It is found that the alloy containing oxygen element is only composed of a single β phase, while the alloy without oxygen element consisted of β and α phases. Although the grain size becomes larger, the elastic de-formation ratio, strength, and hardness of the alloy are all increased with an increase of oxygen content. The as-cast alloy has excellent plastic deformation ability, but the cold-rolled alloy containing oxygen element exhibits brittle characteristics. A conclusion can be drawn that oxy-gen element can stabilize β phase, inhibit the phase transformation from β to α , and furthermore help to increase the strength and elastic de-formation ability of the alloy. 更多展开更多
NiAlHf and NiAlHfCrSi coatings were deposited by electron beam physical vapor deposition(EBPVD).The grain size and orientation of NiAlHf and NiAlHfCrSi coatings were determined by electron backscatter diffraction(EBSD...NiAlHf and NiAlHfCrSi coatings were deposited by electron beam physical vapor deposition(EBPVD).The grain size and orientation of NiAlHf and NiAlHfCrSi coatings were determined by electron backscatter diffraction(EBSD).The NiAlHf coating reveals a more uniform grain size compared to NiAlHfCrSi coating,while the NiAlHfCrSi coating shows a<111>preferential orientation which is parallel to the normal direction of the surface of the coating.The cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings at 1150℃was investigated.Compared to NiAlHf coating,the NiAlHfCrSi coating shows improved resistance to cyclic oxidation and scale spallation.The effect of grain size and orientation on the cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings were investigated at 1150℃.展开更多
文摘The influence of oxygen content on the microstructure and mechanical properties of Ti-23Nb-0.7Ta-2Zr （at%） alloy in as-cast and cold-rolled states was investigated systematically in this paper. It is found that the alloy containing oxygen element is only composed of a single β phase, while the alloy without oxygen element consisted of β and α phases. Although the grain size becomes larger, the elastic de-formation ratio, strength, and hardness of the alloy are all increased with an increase of oxygen content. The as-cast alloy has excellent plastic deformation ability, but the cold-rolled alloy containing oxygen element exhibits brittle characteristics. A conclusion can be drawn that oxy-gen element can stabilize β phase, inhibit the phase transformation from β to α , and furthermore help to increase the strength and elastic de-formation ability of the alloy. 更多
基金financially supported by the National Basic Research Program of China(No.2012CB625100)the National High Technology Research and Development Program of China(No.2012AA03A512)the National Natural Science Foundations of China(Nos.51231001 and 51425102)。
文摘NiAlHf and NiAlHfCrSi coatings were deposited by electron beam physical vapor deposition(EBPVD).The grain size and orientation of NiAlHf and NiAlHfCrSi coatings were determined by electron backscatter diffraction(EBSD).The NiAlHf coating reveals a more uniform grain size compared to NiAlHfCrSi coating,while the NiAlHfCrSi coating shows a<111>preferential orientation which is parallel to the normal direction of the surface of the coating.The cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings at 1150℃was investigated.Compared to NiAlHf coating,the NiAlHfCrSi coating shows improved resistance to cyclic oxidation and scale spallation.The effect of grain size and orientation on the cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings were investigated at 1150℃.
