摘要
非晶材料的高强度及其对温度的敏感性,导致爆炸复合制备非晶块体时下限较大而上限较小,使得焊接窗口较窄。通过对非晶薄带涂铜以降低表面硬度,分析表明,其不仅能降低下限,同时使高速撞击产生的热量主要集中在涂层上,减小非晶薄带的受热影响区域。再利用损伤力学的思想,在装置设计时采用增设缺陷的方法,以削弱到达焊接界面的反射拉伸波强度,提高焊接上限。降低的下限和提高的上限能使焊接窗口有效地扩大,从而使爆炸复合制备非晶块体易于实现。
Because of the high strength and temperature sensitivity of the metal glass,its lower limit is higher and upper limit is lower than that of crystal metal when bulk metal glass was prepared by amorphous foils explosive welding. In this paper,the surface of foils was coated by copper to decrease surface hardness. Results showed that this method can reduce the lower limit, concentrate the energy of plastic collision mainly on coating layer and remarkably minimize foils heat effect zone. Besides, during the experiment designing, ideas of damage mechanics were used to set defects to accelerate the attenuation of tensile waves, so the tensile strength at welding interfaces can be reduced, in combina- tion with the model of thermo-softening at welding interfaces. The upper limit was obviously increased. Both of upper limit and lower limit were improved, and the welding window was effectively expended, so the purpose of preparing bulk metal glass by explosive welding amorphous foils would be easier to implement.
出处
《高压物理学报》
CAS
CSCD
北大核心
2008年第4期364-369,共6页
Chinese Journal of High Pressure Physics
基金
国家部委基金(A2620061131)
关键词
爆炸复合
非晶薄带
温度场
拉伸波
explosive welding
amorphous foils
temperature field
tensile wave
