Formation of chromium carbides in copper matrix during mechanical alloying in carbon-containing media

Effect of the method for producing $$\hbox {Cu}$$ Cu – $$\hbox {Cr}_{3}\hbox {C}_{2}$$ Cr 3 C 2 bulk composites on the structure and properties

“…The X-ray diffraction patterns show only a nanocrystalline solid solution of chromium in copper with a grain size of 4 nm and nanocrystalline chromium ( figure 2b and table 1). The grain size of the copper matrix is close to 7 nm (P2-600) after annealing at 600 • C and it increased up to 31 nm (P2-800) after annealing at 800 • C. Despite the fact that according to the Auger analysis [11], the amount of carbon on the particles obtained in xylene was three times greater than in the case of graphite, carbide formation in the MS process did not occur. After annealing at 600 • C (sample P2-600), the nanocrystalline chromium lines disappear and broad peaks with low intensities, which can be attributed to Figure 2.…”

“…The electrical conductivity was measured at room temperature by the standard four-probe method using V1-13 as the current source and R3009 as the bridge. [11]. The grain size of the copper matrix (table 1) remains virtually unchanged after annealing at 600 • C (sample P1-600) and increases markedly after annealing at 800 • C (sample P1-800).…”

“…Previously, we synthesized Cu-30 vol% Cr 3 C 2 by two methods: mechanically alloying powders of copper, chromium and graphite in argon and mechanically alloying copper and chromium powders in xylene, which served as a carbon source [10,11]. It has been shown that chromium carbide forms through MS in the presence of graphite.…”

Cu-Fe3C(Cr3C2) Bulk Nanocomposites Prepared by Mechanosynthesis Followed by Magnetic Pulse Compaction

“…1) of the Fe30G48 (a), and Cr30G24 and Cr30X24 (b) samples which were recorded after consolidation show the carbides precipitation. The X-ray patterns of the Cr30G24 does not show peaks for carbide phase because of its small grain size [10]. The grain size of the chromium carbide increases after the heat treatment at 600 and 800…”

“…The procedure and parameters of mechanical alloying are detailed in our previous publications [10,11]. The mechanically alloyed powder was consolidated by magnetic pulse compaction with a load of 1.5 GPa [15,16].…”