The maximum plasticity of the above alloy is observed in a certain interval of concentrations of alloying elements, t. e. with a certain amount of the second phase and the corresponding structure of grain boundaries. Undoubted interest is the possibility of reducing the temperature of the transition of molybdenum from a plastic state to fragile during alloying with its rhenium in an amount of up to 50 weight. (35 AT. %).
Another reason for increasing the plasticity of molybdenum alloys is a change in the mechanism of their cold deformation. The alloying of molybdenum weld suture significantly increases the plasticity of the welded joint at normal temperature. The greatest plasticity is observed when the seam is content in the metal of about 50 weight. In this case, the destruction occurs along the near -level zone of the base metal. Due to the increase in the deformation capacity of the joint of the seam, the angle of bending of the welded joint increases by 2-2.5 times compared to the welded connection not alloyed with. However, at the same time, certain difficulties arise related to the poor assimilation of rsia with liquid metal of the welding bath, due to its high melting point (3180 ° C).Therefore, it is obvious, it is advisable to follow the path of creating the appropriate alloys for the possible use of them in dangerous sections of various welded structures. The plasticity of the welded seam of molybdenum can also be increased due to heat treatment after welding, cold processing of welds (at temperatures below recrystallization), increasing the welding and deformation (compression) speed at elevated temperatures. Despite various technological techniques, it is still difficult to get a plastic welded molybdenum seam when welding with melting. Welded compounds of molybdenum have a greater tendency to form cracks.