论文部分内容阅读
用WOL恒位移试样研究了7075铝合金在液体金属Ga中的脆断行为金相跟踪观察表明，Ga吸附后首先促进局部塑性变形，在缺口前方形成四下的塑性区，然后脆性激裂纹形核．液体金属脆断的临界应力强度因子．反向加载（位移V＜0）时，液体金属脆性激裂纹在远离缺口顶端的拉应力区中形核，微裂纹向拉应力区扩展而中止于压应力区反向加载时，试作断裂的名义应力强度因子为．所有断裂试样均为沿晶断口．
Metallographic tracking of the brittle fracture behavior of 7075 aluminum alloy in liquid metal Ga was investigated using a WOL constant displacement sample. The results show that after the adsorption of Ga, local plastic deformation is firstly promoted and four plastic zones are formed in front of the notch, then the brittle crack nuclear. Critical stress intensity factor of liquid metal brittle fracture. In the reverse loading (displacement V <0), the brittle fracture of liquid metal nucleates in the tensile stress zone far away from the tip of the notch, and the microcracks extend to the tensile stress zone and stop at the reverse loading of the compressive stress zone, The nominal stress intensity factor is All fracture specimens are along the fracture.