图1所示为0Zn、0.7Zn、1.5Zn和3.3Zn铸态合金的显微组织

Figure 1 is a 0Zn, 0.7Zn, 1.5Zn 3.3Zn and microstructure of the cast alloy. Visible, 0.7Zn, grain 1.5Zn alloy and significantly less than 0Zn 3.3Zn alloy, and with the increase of Zn content, grain size decreasing trend, indicating the role of Zn alloy structure refinement. 4 alloys distributed in the second phase at the grain boundaries, the number of second phases with the increase in the Zn content is gradually increased, 0Zn only a small amount of alloy present in the second phase position of the local grain boundary, and grain boundary 3.3Zn alloy at the second phase distribution of a continuous web. Compared with 0Zn alloy, 0.7Zn, 1.5Zn 3.3Zn alloy, and in addition there is a second phase at grain boundaries, the grain boundaries is also about the presence of a second phase of a fuzzy, as shown by an arrow shown in FIG. 1c and d , and this phase with the increase of Zn content gradually increases. With increase in Zn content, significant changes occur in the alloy phase.

Figure 1 shows the microstructures of 0Zn, 0.7Zn, 1.5Zn and 3.3Zn cast alloys. It can be seen that the grain of 0.7Zn, 1.5Zn and 3.3Zn alloy is obviously less than 0Zn alloy, and with the increase of Zn content, the grain size shows a gradual decrease trend, which indicates that the Zn element has the function of fine alloy tissue. The second phase is distributed at the crystal boundary, and the number of the second phase is gradually increased with the increase of Zn content, the 0Zn alloy only has a small number of second phases in the local location of the crystal boundary, and the second phase at the 3.3Zn alloy crystal boundary is continuously meshed. Compared with the 0Zn alloy, the 0.7Zn, 1.5Zn and 3.3Zn alloys, in addition to the second phase at the crystal boundary, also have a fuzzy second phase around the crystal boundary, as shown in the arrows in Figure 1c and d, and this phase increases gradually with the increase of Zn content. So with the increase of Zn content, the phase in the alloy changes significantly.

Figure 1 shows the microstructure of 0zn, 0.7zn, 1.5zn and 3.3zn as cast alloys. It can be seen that the grain size of 0.7zn, 1.5zn and 3.3zn alloy is obviously smaller than that of 0zn alloy, and with the increase of Zn content, the grain size gradually decreases, which shows that Zn element has the role of refining the alloy structure. The number of the second phase increased with the increase of Zn content. There were only a small number of the second phase at the local position of the grain boundary in 0zn alloy, while the second phase at the grain boundary of 3.3zn alloy showed a continuous network distribution. Compared with 0zn alloy, 0.7zn, 1.5zn and 3.3zn alloy have a kind of fuzzy second phase around the grain boundary besides the second phase at the grain boundary, as shown by the arrow in Fig. 1c and D, and this phase increases gradually with the increase of Zn content. Therefore, with the increase of Zn content, the phase in the alloy changes obviously.<br>