材料期刊网

Blue-shift of Nano-Y_2O_3 : Eu~(3+) Emission Spectra Excited by X-ray

Qiang LI , Lian GAO , and Dongsheng YAN(State Key Lab. of High Performance Ceramics & Superfine Microstructure , Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China)

材料科学技术（英文）

Nano-Y_2O_3:Eu~(3+) powder was prepared by the homogeneous precipitation. With controlling the conditions of the reaction, nano powders with different grain size were obtained. It is found that the blue-shift phenomena exist in the nano-Y2O3:Eu3+ emission spectra excited by X-ray. The wave lengths of the peak (5D0→7F2) are related with the grain size of the powder

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A Model of Dynamic Recrystallization in Alloys during High Strain Plastic Deformation

Qiang LI , Yongbo XU , Zuhan LAI , Letian SHEN , Yilong BAI

材料科学技术（英文）

Recrystallized grains, less than 200 nm in diameter were observed in heavily shear zones of a high strength low alloy steel and a Ni-based alloy, and Also grain refinement, less than 3 μm in diameter was made in high purity aluminum by ECAE at ambient temperature. The experimental results showed that high strain rate and large deformation could induce dynamic recrystallization. Based on dislocation dynamics and grain orientation change enhanced by plastic deformation, a model for the recrystallization process is developed. The model is used to explain the ultra fine grains which are formed at a temperature still much lower than that for the conventional recrystallization.

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Silicon Strengthened CrAlVN Coatings

Qiang LI , Yue-xiu QIU , Bo LI , Dong-liang ZHAO , De-en SUN , De-hui LI

钢铁研究学报(英文版)

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