How to maintain the excellent mechanical properties at high temperature, but also to take into account the excellent room temperature plasticity and processing capacity, has been the difficulty of ultra-high temperature refractory alloy design. Ta-W alloys with W content (atomic fraction) of 10%, 20%, 30%, 40% and 50% were prepared by vacuum arc melting. These alloys form a single phase solid solution with bcc structure that is uniformly miscible with Ta and W, and its grain size decreases with the increase of W content. The compressive stress-strain curves of Ta-W alloy at room temperature (25℃) and high temperature (2000℃) were tested. The results show that the compressive strength of Ta-W alloy increases with the increase of W content at both room temperature and high temperature, and the increase amplitude tends to be gentle when the W content exceeds 20%.
It is worth noting that Ta-W alloy has excellent high temperature strength at 2000℃, for example, the yield strength of Ta-20%W alloy can reach 236 MPa, and at the same time has more than 40% of room temperature compression strain and good (machine) processing capacity. The existing theoretical models predict the compressive strength of the alloy at room temperature and high temperature well, and the main strengthening mechanism is solid solution strengthening. The alloy system is expected to be used as a new type of ultra-high temperature material in the key bearing structural components of aerospace.
Tantalum and Ta2.5W alloy: widely used in chemical industry, among which tantalum tungsten alloy corrosion resistance is better than pure tantalum;
Ta10W alloy: Suitable for high temperature, high pressure, corrosion resistance and other working environment, widely used in chemical industry, aerospace, atomic energy industry and high temperature components and other fields.
