所研究合金的化学成分、密度和极限拉伸强度等列于表1。检测冲击能量,采用无切口V型试样(10×10×55mm),试验温度为-40×C—环境温度,有些情况到-60℃。冲击能量与密度的关系示于图1。由图可见,冲击能量随密度的增加而增加。当密 The chemical composition, density and ultimate tensile strength of the investigated alloys are shown in Table 1. Impact energy was measured using a non-cutting V-shaped specimen (10 × 10 × 55 mm) at a test temperature of -40 × C-ambient temperature and in some cases to -60 ° C. The relationship between impact energy and density is shown in Figure 1. As can be seen from the figure, the impact energy increases with increasing density. When dense