3D online submicron scale observation of mixed metal powder's microstructure evolution in high temperature and microwave compound fields.
3D online submicron scale observation of mixed metal powder's microstructure evolution in high temperature and microwave compound fields.
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DOI：
10.1155/2014/684081
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发表时间：
2014
影响因子：
--
通讯作者：
Xiao TQ
中科院分区：
文献类型：
--
作者：
Kang D;Xu F;Hu XF;Dong B;Xiao Y;Xiao TQ
为了研究极端环境下金属粉末组织演变对力学性能的影响，采用同步辐射计算机形貌术（SR-CT）技术实现了Al-Ti混合粉末在高温微波复合场中组织演变的三维实时观察;通过设计的装置和引入优良的重建方法，首次将空间分辨率提高到0.37 μm/pixel。从二维和三维重建图像中可以清楚地区分烧结过程中的微观结构演变过程。给出了典型的烧结参数，如烧结颈尺寸，孔隙率，和样品的颗粒尺寸的定量分析的机械性能和微波烧结过程中的烧结动力学的影响。获得了颈部尺寸-时间曲线，颈部生长指数为7.3，表明表面扩散是主要的扩散机制，其原因是外部微波场引起的涡流损耗为颗粒表面的质量扩散提供了额外的驱动力。从重建图像以及孔隙率和平均颗粒尺寸与温度的关系曲线来看，液相铝的存在加速了致密化和颗粒生长。
In order to study the influence on the mechanical properties caused by microstructure evolution of metal powder in extreme environment, 3D real-time observation of the microstructure evolution of Al-Ti mixed powder in high temperature and microwave compound fields was realized by using synchrotron radiation computerized topography (SR-CT) technique; the spatial resolution was enhanced to 0.37 μm/pixel through the designed equipment and the introduction of excellent reconstruction method for the first time. The process of microstructure evolution during sintering was clearly distinguished from 2D and 3D reconstructed images. Typical sintering parameters such as sintering neck size, porosity, and particle size of the sample were presented for quantitative analysis of the influence on the mechanical properties and the sintering kinetics during microwave sintering. The neck size-time curve was obtained and the neck growth exponent was 7.3, which indicated that surface diffusion was the main diffusion mechanism; the reason was the eddy current loss induced by the external microwave fields providing an additional driving force for mass diffusion on the particle surface. From the reconstructed images and the curve of porosity and average particle size versus temperature, it was believed that the presence of liquid phase aluminum accelerated the densification and particle growth.
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影响因子：
--
作者：
Yan J;Shen Y;Li F;Li T
通讯作者：
Li T
影响因子：
1.2
作者：
Kawamura, Y;Hayashi, K;Masumoto, T
通讯作者：
Masumoto, T
影响因子：
3.2
作者：
Ma, J.;Diehl, J. F.;Zimmerman, D. T.
通讯作者：
Zimmerman, D. T.
影响因子：
5.2
作者：
Olmos, Luis;Martin, Christophe L.;Bouvard, Didier
通讯作者：
Bouvard, Didier
影响因子：
3.6
作者：
Chen, R. C.;Xie, H. L.;Xiao, T. Q.
通讯作者：
Xiao, T. Q.