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| 1 | Effect of a High Magnetic Field on the Shape of the γ' Precipitates in Cast Nickel-based Superalloy K52显示文摘The shape change of the γ' precipitates of cast Ni-based superalloy K52 after aging treatment under a high magnetic field was investigated. The results show that duplex γ' precipitates are present in the γ' matrix after aging treatment with or without the magnetic field. One is the coarse particles with average size of 500 nm; the other is fine spherical γ' precipitates with average of 100 nm in diameter. The application of a 10T magnetic field only results in the shape of the coarse γ' particles changing from spherical to cuboidal when the alloys subjected to the same heat treatments. This shape change was mainly discussed based on the strain energy increase caused by the difference in magnetostriction between the γ' matrix and γ' precipitates. The fine γ' particles still keep spherical. Further TEM observations shows that a number of γ' particles in nano-scale precipitate in the coarse γ' particles in the specimens treated without the magnetic field. In addition, it was found that the magnetic field caused the decrease of the hardness in the alloy, and the hardness was associated with the field direction. | X. Ren G.Q. Chen W.L. Zhou C.W. Wu C. Yuan J.S. Zhang | 2009 | Journal of Materials Science & Technology2009，25，3： | 6 |
| 2 | SUPERPLASTICITY OF A Ni-28.5Al-20.4Fe INTERMETALLIC ALLOY显示文摘Our previous investigation examines the soperplastic behavior of an extruded Ni-28.5Al-20.IFe alloy. Its tensile properties were determined at temperature from 1123Kto 1323K and initial strain rates from 1.0{x 10-2s-1 to 1.04x 10-4s-1. A maximumelongation of 233K was obtained at 1123K and a strain rate Oj 5.2x 10-4s-1. Fur-thermore, microstructural features, such a8 decrease in the avempe gmin Bize afier de-formation at 85dC and 98dC the presence oj many dislocationthee gmins adjacentto grains with a high dislocation density, indicate that dynamic recrystallization hasoccuwed as an decient accotnmodation mechanism. SEM examination Of the fracturesample afier saperplastic defOrmation revealS many voids on the hecture sudece. Bycoerelating with the results Oj TEM observation, it is sopested that the soperplasticdejormation in this alloy should be controlled by a gmin boundarp sliding-based mech-anism accommodated by the movement oj dislocation and dynamic recrpstallization. | Zhou, W.L. Guo, J.T. Chen, R.S. Zhou, J.Y. | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，3： | 2 |
| 3 | Pharmacological activities of Delphinium chuanxienses显示文摘 | W.L. Zhang M.H. Zhou | | 0，，01： | 1 |
| 4 | The Origin of Triangular Surface Defects in 4H-SiC CVD Epilayers显示文摘 | Zhou W.L. Pirouz P. Powell J. Anthony | 1998 | Materials Science Forum1998，，264： | 1 |
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