Anisotropic microstructural evolution and coarsening in free sintering and constrained sintering of metal film by using FIB-SEM tomography
Anisotropic microstructural evolution and coarsening in free sintering and constrained sintering of metal film by using FIB-SEM tomography
复制标题
利用 FIB-SEM 断层扫描研究金属薄膜自由烧结和约束烧结过程中的各向异性微观结构演化和粗化
DOI：
10.1016/j.actamat.2021.117087
复制
发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Wakai Fumihiro
中科院分区：
文献类型：
--
作者：
Okuma Gaku;Miyaki Ryo;Shinobe Kan;Sciazko Anna;Shimura Takaaki;Yan Zilin;Hara Shotaro;Ogashiwa Toshinori;Shikazono Naoki;Wakai Fumihiro
在粉末加工和约束烧结过程中，形成了各向异性的显微组织。采用纤维束扫描电镜（FIB SEM）研究了Au亚微米颗粒在自由烧结和约束烧结过程中的微观结构演变。在致密化过程中，总比表面积减小，固相平均截距增加，粗化程度增加。用面积加权组构张量表征了铸塑过程中球形颗粒的各向异性堆积结构，该张量表征了键的取向和接触面积的各向异性。在自由烧结中，堆积结构的初始各向异性随着致密化而减小。在约束烧结中，由孔隙平均截距长度观察到的初始各向异性在后期被逆转。微观结构演变为沿着厚度方向形成细长孔。提出了一个开放的孔隙结构模型来解释中间阶段的微观结构演化。
The anisotropic microstructure develops during powder processing and constrained sintering. FIB-SEM tomography was used to investigate the microstructural evolutions of Au submicron particles during free sintering and constrained sintering. The decrease in total surface area and the coarsening, i.e. the increase of mean intercept length of solid phase, were observed during the densification process. The anisotropic packing structure of spherical particles induced by casting process was characterized by area weighted fabric tensor, which represented the bond orientation and the anisotropy of contact area. In free sintering, the initial anisotropy in packing structure decreased with densification. In constrained sintering, the initial anisotropy observed by the mean intercept length of pore was reversed in the later stage. The microstructure evolved so as to form the elongated pores along the thickness direction. An open pore structure model was presented to explain the microstructural evolution in the intermediate stage.