As the the number of thermal shock increasing, in the partial region of ceramic layer, the crack in all directions interweaved together.
而且随着热震次数的增加，在陶瓷层局部区域，各种方向的裂纹交织在一起。
2
There are three main interior structure defects in the preparation of aluminum foam with melt foaming process such as free-bubble-layer at the bottom, partial free-bubble-zone and heat crack.
泡沫铝常见的内部缺陷主要有底部无泡层、局部无泡区和内部热裂纹。
3
The results show that the partial unmelted region, casting defect structure and secondary crack form in the welding seam, which result in the low stress breakage of the samples.