论文部分内容阅读
应用高温金相显微术研究了晶粒平均直径为6.8μm的LC4铝合金在505℃超塑性变形过程中的显微组织变化.所获得的主要结果如下:(1)超塑性变形过程中存在广泛的晶界滑动和晶粒转动。(2)超塑性变形过程中原有晶粒的等轴形状及其尺寸基本上保持不变,而且变形前原来位于材料表面的晶粒,在超塑性拉伸变形后仍然位于材料表面,但部分原来的相邻晶粒会发生分离,它们之间由表面下移来的晶粒形成新的表面,导致试样表面积的增加。(3)超塑性变形的主要机制为晶界滑动所导致的三维的晶粒重排。
The microstructure of LC4 aluminum alloy with average grain size of 6.8μm during superplastic deformation at 505 ℃ was studied by high temperature metallographic microscopy. The main results obtained are as follows: (1) There is a wide range of Grain boundary sliding and grain rotation. (2) In the process of superplastic deformation, the original equiaxed shape of the grains and their size are basically unchanged, and the grains originally located on the surface of the material before the deformation are still located on the surface of the material after the deformation of the superplasticity. However, Of the adjacent grains will be separated, the surface between the particles formed by the movement of the surface to form a new surface, resulting in an increase in the sample surface area. (3) The main mechanism of superplastic deformation is the three-dimensional grain rearrangement caused by grain boundary sliding.