Fabricating high performance tungsten alloys through zirconium micro-alloying and nano-sized yttria dispersion strengthening

Microstructure and tensile properties of tungsten at elevated temperatures

“…9. Tensile curves of the HF tungsten specimens tested in a temperature range 150e500 C. Compared with the preliminary tensile data obtained from a 20 mm thick plate of the same batch of tungsten and with larger tensile specimens [14], the present results show similar strength but greater elongation values. This is in agreement with general observations of tungsten materials.…”

Mechanical Properties, Thermal Stability and Microstructures of W-Re-ZrC Alloys Fabricated by Spark Plasma Sintering

“…With an increase in the tested temperature, the UTS slightly decreases by 2.3% to 799 MPa, 6.7% to 763 MPa, 10.5% to 732 MPa and 17.7% to 673 MPa for the specimens tested at 400 • C, 500 • C, 600 • C and 700 • C, respectively. In contrast, for other reported SPSed tungsten materials, such as pure W (W) [14], W-0.5wt.%ZrC (WZC) [17] and W-0.2wt.%Zr-1.0wt.%Y 2 O 3 (WZY) [14], they all exhibit low strength and obvious brittle fractures below 500 • C. That is to say, the present WRZ alloy achieves a considerable plasticity in relatively low temperatures. The UST of WZY achieves the highest value of 610 MPa among the three reported samples at 500 • C. Meanwhile, all UTS values of WZR alloys (see Figure 7b) are higher than that of the aforementioned materials, which reflects that the solid solution strengthening of the Re addition can significantly improve high-temperature strength.…”

“…Another effective approach that overcomes embrittlement and improves tensile strength at low temperatures is dispersing second-phase particles, e.g., oxide and carbide, in the tungsten matrix [12][13][14][15][16][17][18][19]. The oxide and carbide can refine grain size, resulting in an increased grain boundary (GB) volume and density.…”

Mechanical properties and thermal stability of rolled W-0.5wt% TiC alloys

“…The asrolled W-0.5 wt% TiC alloys show a typical brittle fracture at RT and turn into plasticity at 200°C with a high strength of 789 MPa and an elongation of $ 4.8%, indicating its DBTT is about 200°C. The UTS of the rolled W-0.5 wt% TiC is much higher than the reported value in bulk pure W [31] and W alloys [32,33] and the ductility at lower temperature is better than spark plasma sintered W alloys [32]. These enhanced mechanical property is due to the synergetic effects of nanosized dispersion strengthening, optimized rolling processes and appropriate annealing treatments.…”