Shock compaction of powders for making crack-free bulk materials including the effect of shock-induced heat in micro-area

本研究试图建立一种冲击压实粉末的方法，以获得无裂纹的块体材料。此外，还讨论了冲击压实过程中微区热能的影响。首先，提出了一种新的冲击压实装置，该装置利用炸药的爆炸作用将其转化为水下冲击波。在数值分析的基础上，利用锰铜压力计进行了测量，得到了压强分布和压强分布。该方法只需改变炸药与样品之间的距离即可控制加压条件，炸药的爆速不变。利用新设计的组件，为冲击压实制备Al-SiCp和Mg-SiCp复合材料提供了可能性。提出了用混合元素粉末合成金属间化合物的可能性。随着物理条件的快速变化，合成的金属间化合物呈现出纳米级的亚结构，使其具有高性能。提出了一种利用金属间化合物合成薄涂层的新方法。

The present investigation tried to establish a method for shock compaction of powders to obtain crack-free bulk materials. Also, the effect of thermal energy induced in micro-area during shock compaction was discussed. At first, a new assembly for shock compaction was proposed which used the detonation of an explosive to convert it into underwater shock wave. The pressure distribution and the pressure profile was controlled based on the numerical analysis as well as the measurement using manganin gage. The method proposed enables to control the pressurizing condition only by changing the distance between the explosive and the sample using an explosive which has stable detonation velocity. Using the assembly newly designed, the possibility for making Al-SiCp and Mg-SiCp composites through shock compaction. Also, the possibility of synthesizing intermetallics from mixed element powders was suggested. The synthesized intermetallic showed nano-sized substructure based on the rapid change of the physical conditions which enables to show highly-functional properties. A new method of synthesizing thin coating layer by intermetallics was also suggested.