论文部分内容阅读
金属物理教研室主要负责金属应力腐蚀断裂机理的研究。发展了氢致开裂理论,通过大量的实验研究,证实了多种材料都存在氢致型性变形而后引起开裂的规律;测出了氢在α铁中的应变场是非球对称的,通过理论计算更正了过去铁中关于氢致非球对称应变场的计算结果;首次指出氢引起的表观弹性模量变化有两部分,一部分和原子键合力有关,另一部分和局部应力松弛有关,并可用实验加以区分。实验证明氢虽然能降低铁的表观弹性模量,但不影响和原子键合力有关的弹性模量。通过实验观察和理论计算,发现氢能促进金属中位错的增殖和运动,使解理裂纹易于形成,发展了氢致解理断裂机制,在超高压电镜下研究跟踪钛合金的氢致开裂过程中,进一步证实了另一个氢致相变——开裂机制;在硅单晶中通过结构变化算出了导致裂纹形核的氢压值,为氢压理论提
Department of Metal Physics is mainly responsible for the study of the mechanism of metal stress corrosion cracking. Hydrogen induced cracking theory was developed. Through a large number of experimental studies, it was confirmed that a variety of materials are hydrogen induced deformation and then lead to cracking. The hydrogen field in the α-iron strain is aspheric symmetry. By theoretical calculation Correct the iron in the past on the hydrogen induced aspheric symmetry strain field calculation results; for the first time pointed out that the hydrogen induced apparent elastic modulus changes in two parts, one part and the atomic bonding force, the other part of the local stress relaxation, and available experiment Be distinguished. Experiments show that although hydrogen can reduce the apparent elastic modulus of iron, it does not affect the elastic modulus related to the atomic bonding force. Through experimental observations and theoretical calculations, it was found that hydrogen promoted the growth and movement of dislocations in metals, facilitated the formation of cleavage cracks, developed a mechanism of hydrogen-induced cleavage and studied the hydrogen-induced cracking process of titanium alloys under ultrahigh-pressure electron microscopy , Further confirmed another hydrogen induced phase change - cracking mechanism; calculated in the silicon single crystal by structural changes caused by the nucleation of cracks in the hydrogen pressure value for the hydrogen pressure theory to mention