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Institute of Materials Science at Jilin University——A Brief Overview

WANG Yuming Institute of Materials Science , Jilin University , Changchun , 130023 , China

关键词:

X-RAY ANALYSIS OF WORK-HARDENING PROCESS FOR POLYCRYSTALLINE α-BRASS DURING UNIAXIAL TENSILE TESTS

TENG Feng'en WANG Yuming Institute of Materials Science , Jilin University , Changchun , China Associate Professor , Institute of Materials Science , Jilin University , Changchun 130021 , China

金属学报(英文版)

X-ray diffraction Fourier profile analysis has been performed for polycrystalline α-brass plate with 31.55 wt-% Zn after a series of uniaxial tensile tests with different strain rates. Dislocation density p and configuration parameter M may be presented as a function of ap- plied stress σ_a.A mechanism of alternative long-range and short-range strain hardening has been proposed.

关键词: α-brass , null , null

M(?)ssbauer Spectra for Ultrafine Particles Fe_3O_4

Haibo LI Weitao ZHENG Yudong LIU Ruilin ZHANG Department of Materials Science , Jilin University , Changchun , 130023 , China

材料科学技术（英文）

The procedure of preparing specimens of ultrafine particles (UFP) Fe_3O_4 was studied and the measurement and analysis of the Mssbauer spectra at room temperature was made.After the hyperfine field due to iron was analyzed carefully,it is shown that the interaction of the interfaces be- tween grains of UFP Fe_3O_4 has stronger effects (enlarging the quadrupole splitting in Mssbauer spectrum) and it is found that superparamagnetic effects appear,which means that the magnetic property of UFP Fe_3O_4 is different from that of bulk Fe_3O_4.

关键词: UFP , null , null