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| 1 | Characteristics of a multi-component MgO-based bioceramic coating synthesized in-situ by plasma electrolytic oxidation显示文摘Plasma electrolytic oxidation(PEO)has held great potential for the advancement of biodegradable implants,as it helps in developing porous bioceramic coatings on the surface of magnesium alloys.In this research work,MgO-based bioceramic coatings containing the Si,P,Ca,Na,and F elements have been successfully fabricated on an AZ31 magnesium alloy plate utilizing the PEO method.The characteristic current-voltage behavior of the samples during the process was surveyed in an electrolyte containing Ca(H_(2)PO_(4))_(2),Na_(2)SiO_(3)·9H_(2)O,Na_(3)PO_(4)·12H_(2)O,NaF,and KOH with a pH of 12.5 and electrical conductivity of 20 mS/cm^(-1).The results revealed that applying a voltage of 350-400 V(that is 50-100 V higher than the breakdown limit)could greatly facilitate the synthesis of a PEO ceramic coating with fewer defects and more uniform morphology.The resulting coating was a compositionally graded bioceramic layer with a thickness in the range of 3.5±0.4 to 6.0±0.7µm,comprising the above-mentioned elements as promising bioactive agents.The synthesized ceramic features were investigated in terms of the elemental distribution of components through the thickness,which indicated a gradual rise in the Si and P contents and,conversely,a decline in the F content towards the outer surface.The growth mechanism of the PEO coating has been discussed accordingly. | Nasrinsadat Azarian Seyed Mohammad Mousavi Khoei | 2021 | Journal of Magnesium and Alloys2021，9，5： | 4 |
| 2 | T6热处理对7075铝合金FSW接头蠕变性能的影响显示文摘采用光学显微镜(OM)、差示扫描量热仪(DSC)、扫描电镜(SEM)、透射电镜(TEM)以及高温拉伸蠕变装置等研究了7075铝合金搅拌摩擦焊(FSW)接头经T6热处理后的显微组织、析出相以及蠕变性能。结果表明:经T6热处理后,7075铝合金搅拌摩擦焊接头焊核区细小的等轴晶发生长大,重新析出的η′相在数量、尺寸和分布状态均优于未热处理的接头;热处理后焊接头的稳态蠕变速率降低了至少1个数量级,蠕变寿命提高了2倍以上,蠕变机制由晶界扩散控制的位错滑移机制转变为自扩散控制的位错滑移机制。 | 沈会 王江涛 陈佳伟 谢利 何明涛 王明智 卢雅琳 | 2023 | 材料热处理学报2023，44，2： | 1 |
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