Formation of Intermetallic Compounds During Explosive Welding
- PDF / 7,225,219 Bytes
- 13 Pages / 593.972 x 792 pts Page_size
- 91 Downloads / 282 Views
ODUCTION
THIS study is a continuation of Reference 1, but it deals with joints featuring a sufficiently high mutual solubility of initial elements. In Reference 1, the microheterogeneous structure was studied in the local melted zones occurring during explosive welding and related to joints that possessed almost no such solubility. The study showed that melting could be initiated, in particular, by flying away of particles resulting from granulating fragmentation (GF). This is one of the fastest processes during explosive welding; it is similar to fragmentation during ordinary explosions, but it takes place in the presence of various strong barriers. For particles flying away during explosive welding from the first plate, such barriers stopping them will be both the second plate and the remaining mass of the original plate. It is assumed that flying away of solid particles of the phase that is not subjected to melting will initiate local melting of a more easily melted material near the interface. This is connected BELLA A. GREENBERG, Professor, and ALEXEI V. INOZEMTSEV and ALEXANDER M. PATSELOV, Senior Researchers, are with the M.N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskaya str. 18, Ekaterinburg, 620990, Russia. Contact e-mail: [email protected] MIKHAIL A. IVANOV, Professor, is with the Kurdyumov Institute of Metal Physics, National Academy of Sciences of Ukraine, Vernadskogo blvd. 36, Kiev, 03680, Ukraine. MARK S. PUSHKIN, Postgraduate, and ANATOLIY P. TANKEYEV, Professor, are with the M.N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, and also with The Ural Federal University named after the first President of Russia B.N. Yeltsin, Mira str. 19, Ekaterinburg, 620002, Russia. SERGEY V. KUZMIN and VLADIMIR I. LYSAK, Professors, are with the Volgograd State Technical University, 28 Lenin Av., Volgograd, 400005, Russia. Manuscript submitted January 13, 2016. Article published online August 23, 2016 METALLURGICAL AND MATERIALS TRANSACTIONS A
with the fact that due to a large total area of the particles, an effective friction between them and the barrier may cause local heating sufficient for melting. This fact is substantiated by multiple observations of refractory phase particles within the local melted zones. During studies of the interface structure, a self-similarity of its constituent elements was found. Based on that, fractal analysis of the interface was performed. Depending on external conditions, melting either ensures cohesion (adhesion) of contacting materials, or leads to the formation of risk zones. If there is no mutual solubility of original phases, solidified zones of local melting become colloidal solutions of nonmixing liquids, such as emulsions or suspensions. The emulsions are sensitive to delamination and may be dangerous for the continuity of joints. On the contrary, suspensions containing refractory phase particles serve as dispersion strengthened inclusions within the melted (and then solidified) easily melting phase. Such in
Data Loading...
