“…Till now, considerable research efforts have been devoted to prepare W-Y 2 O 3 alloy with small grain size and high relative density simultaneously. However, a good balance between them is always difficult to be achieved in previous studies 17, 26 . With nearly full densification, the grain size of W-Y 2 O 3 alloy fabricated by improved wet chemical method and subsequent SPS in our work is much smaller than that reported in previous studies.Figure 4SEM images of the fracture surfaces ( a ) W-Y 2 O 3 alloy fabricated by traditional wet chemical method and subsequent SPS, ( b ) W-Y 2 O 3 alloy fabricated by improved wet chemical method and subsequent SPS.
…”
With the aim of preparing high performance oxide-dispersion-strengthened tungsten based alloys by powder metallurgy, the W-Y2O3 composite nanopowder precursor was fabricated by an improved wet chemical method with anion surfactant sodium dodecyl sulfate (SDS) addition. It is found that the employment of SDS can dramatically decrease W grain size (about 40 nm) and improve the size uniformity. What’s more, SDS addition can also remarkably improve the uniform dispersion of Y2O3 particles during the synthesis process. For the alloy whose powder precursor was fabricated by traditional wet chemical method without SDS addition, only a few Y2O3 dispersoids with size of approximate 10–50 nm distribute unevenly within tungsten grains. Nevertheless, for the sintered alloy whose powder precursor was produced by improved wet chemical method, the Y2O3 dispersoids (about 2–10 nm in size) with near spherical shape are dispersed well within tungsten grains. Additionally, compared with the former, the alloy possesses smaller grain size (approximate 700 nm) and higher relative density (99.00%). And a Vickers microhardness value up to 600 Hv was also obtained for this alloy. Based on these results, the employment of SDS in traditional wet chemical method is a feasible way to fabricate high performance yttria-dispersion-strengthened tungsten based alloys.
“…Till now, considerable research efforts have been devoted to prepare W-Y 2 O 3 alloy with small grain size and high relative density simultaneously. However, a good balance between them is always difficult to be achieved in previous studies 17, 26 . With nearly full densification, the grain size of W-Y 2 O 3 alloy fabricated by improved wet chemical method and subsequent SPS in our work is much smaller than that reported in previous studies.Figure 4SEM images of the fracture surfaces ( a ) W-Y 2 O 3 alloy fabricated by traditional wet chemical method and subsequent SPS, ( b ) W-Y 2 O 3 alloy fabricated by improved wet chemical method and subsequent SPS.
…”
With the aim of preparing high performance oxide-dispersion-strengthened tungsten based alloys by powder metallurgy, the W-Y2O3 composite nanopowder precursor was fabricated by an improved wet chemical method with anion surfactant sodium dodecyl sulfate (SDS) addition. It is found that the employment of SDS can dramatically decrease W grain size (about 40 nm) and improve the size uniformity. What’s more, SDS addition can also remarkably improve the uniform dispersion of Y2O3 particles during the synthesis process. For the alloy whose powder precursor was fabricated by traditional wet chemical method without SDS addition, only a few Y2O3 dispersoids with size of approximate 10–50 nm distribute unevenly within tungsten grains. Nevertheless, for the sintered alloy whose powder precursor was produced by improved wet chemical method, the Y2O3 dispersoids (about 2–10 nm in size) with near spherical shape are dispersed well within tungsten grains. Additionally, compared with the former, the alloy possesses smaller grain size (approximate 700 nm) and higher relative density (99.00%). And a Vickers microhardness value up to 600 Hv was also obtained for this alloy. Based on these results, the employment of SDS in traditional wet chemical method is a feasible way to fabricate high performance yttria-dispersion-strengthened tungsten based alloys.
“…Various dispersoids such as TiC, ZrC, HfC [9][10][11], Y 2 O 3 , ZrO 2 , ThO 2 , La 2 O 3 [12][13][14][15], and TiN [16] have been explored along with refractory metals such as Re, Mo, and W [17][18][19]. For example, a W composite with 3.6 wt.% Re can show a strength of 230 MPa, while that of monolithic tungsten is 130 MPa.…”
“…In one of our previous publications, W-0.2wt%Zr alloy showed considerable enhancement in the room-temperature fracture strength and toughness, because the Zr could capture oxygen in tungsten, form nano-scaled zirconia particles, and effectively alleviate the detrimental effect of oxygen [20]. Dispersing small amounts of oxide particles, such as La 2 O 3 , Y 2 O 3 , and HfO 2 into W and forming the so-called oxide-dispersion-strengthened W (ODS-W), can refine the grains and inhibit the movement of dislocations and GBs, and thus increase the high-temperature strength, recrystallization temperature, and creep resistance [21][22][23][24][25][26]. Furthermore, the refined microstructure with abundant grain boundaries and oxide-W interfaces may also benefit to improving irradiation-resistance [15].…”
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