The mechanical properties and microstructure of 90w-7ni-3fe and Ta alloy with different content were studied by liquid phase sintering. Results show that: after 1480 ℃ 7 x 1 h process preparation of 90 w - ni - fe alloy 3 in density (99.88%) cases, to take three points bending method of elastic modulus E of 286 gpa, the tensile strength of 853 mpa, the elongation rate 9%, rockwell hardness HRC25.3. The elastic modulus decreases rapidly with the increase of porosity P. After 1100 ℃, 1200 ℃ heat treatment is slightly improve the strength, elongation, hardness increased significantly, but the elastic modulus is no obvious change. The obtained samples have uniform microstructure, grain size 30 microns, and there are four kinds of fracture modes, mainly W grain transgranular fracture. The phase structure of the alloy did not change dramatically within the range of adding 1-7% Ta, and the elastic modulus decreased slowly with the increase of alloying element content. There is a critical point component in the relationship curve between alloy strength and Ta content, that is, 5% Ta, whose tensile strength can reach 116MPa. Before 5% Ta, the tensile strength increases with the increase of alloying element content, but then decreases rapidly. Ta to add block alloy densification, after 1440 ℃ sintering, all alloy density between 96-98.5%.
High-density tungsten alloy is a kind of tungsten based alloy with Ni, Fe, Mn, Co and other elements added. Its density is up to 16.5 ~ 19.0g/cm3. High density tungsten alloy not only has high density, but also has a series of excellent properties, such as high strength, high hardness, good ductility, good mechanical processing performance, small thermal expansion coefficient, high thermal conductivity, good oxidation and corrosion resistance, good weldability. These excellent properties make it widely used in the field of advanced science and technology, military and civil industry. Research status of tungsten-base high-density alloy tungsten-base high-density alloy is a two-phase microstructure alloy formed by matrix phase and bonding phase. Tungsten alloy must have a good microstructure in order to improve its toughness and strength, we mainly use heat treatment to build its surrounding structure. At present, domestic commonly used heat treatment technologies include circulating heat treatment, solid solution quenching heat treatment, chemical heat treatment, argon gas atmosphere heat treatment, deformation heat treatment and vacuum heat treatment. 3.262.676.5 purity (%)99.999.799.5 table 3-1 raw material performance index 3.2-1 preparation of tungsten-base high-density alloy preparation of tungsten-base high-density alloy.
