Jingyang WANG
,
Enke TIAN
,
Chiwei LUNG
材料科学技术（英）
By using Morse potential model, we calculate the temperature dependence of critical resolved shear stress (CRSS) of some single crystals. Dislocation-phonon interaction is considered in this paper. Theoretical calculations fit experimental law well. Investigations show: interatomic force is the physical intrinsic that controls the plastic deformation processing of materials, and the temperature dependence of CRSS mainly comes from the temperature dependence of dislocation vibration.
关键词:
Jie DENG
,
Qiyi LONG
,
Chiwei LUNG
材料科学技术（英）
In this letter, a new method was proposed to visualize the crack front in stress corrosion fracture of high strength steel. The fractal characteristic of the crack front was analyzed by measuring its fractal dimension and roughness exponent at the same time. The experimental results show that the irregularity of the crack front was partly self-affine.
关键词:
Dingchuan Xue
材料科学技术（英）
The corrosion behavior of pure Mg, AZ31, and AZ91D were evaluated in various in vitro and in vivo environments to investigate the potential application of these metals as biodegradable implant materials. DC polarization tests and immersion tests were performed in different simulated body solutions, such as distilled (DI) water, simulated body fluid (SBF) and phosphate buffered solution (PBS). Mg/Mg alloys were also implanted in different places in a mouse for in vivo weight loss and biocompatibility investigations. The in vivo subcutis bio-corrosion rate was lower than the corrosion rate for all of the in vitro simulated corrosive environments. The Mg/Mg alloys were biocompatible based on histology results for the liver, heart, kidney, skin and lung of the mouse during the two months implantation. Optical microscopy and scanning electron microscopy were carried out to investigate the morphology and topography of Mg/Mg alloys after immersion testing and implantation to understand the corrosion mechanisms.
关键词:
Mg/Mg alloys
