Effects of W content by mass on the microstructure and mechanical properties of Mo-W alloy
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摘要: 采用粉末冶金法制备含不同质量分数W(20%~80%)的Mo-W合金, 研究W含量对Mo-W合金组织结构与力学性能的影响。结果表明: 烧结过程中Mo与W相互扩散形成单相固溶体。W质量分数的增加能显著降低Mo-W合金的晶粒尺寸, 经1990℃烧结的Mo-80W合金晶粒尺寸比Mo-20W合金下降了46.5%。随W质量分数的增加, Mo-W合金的维氏硬度呈“双驼峰”形变化趋势, 在W质量分数为40%与60%处出现峰值。Mo-W合金的相对密度和抗拉强度随W质量分数的增加而下降, 抗拉强度最大值出现在烧结温度为1990℃的Mo-20W合金, 达到514.83 MPa; 随烧结温度的升高, 低W含量的Mo-W合金(W质量分数20%~40%)抗拉强度呈先上升后下降趋势, 而高W含量的Mo-W合金(W质量分数60%~80%)抗拉强度逐渐升高。Mo-W合金断裂方式为沿晶断裂与穿晶断裂相结合的混合模式。Abstract: Mo-W alloys with the W content by mass of 20%~80% were produced by the conventional powder metallurgy technology, the effects of W content on the microstructure and mechanical properties of Mo-W alloy were studied in this paper. The results show that the single phase solid solution is formed by the interdiffusion of W and Mo during the sintering process. The grain size decreases significantly with the increase of W content by mass. The grain size of Mo-80W alloy decreases by 46.5% compared with that of Mo-20W alloy at the sintering temperatures of 1990. With the increase of W content by mass, a℃.double dump. trend of Vickers hardness can be observed, and the peak value appears at 40% W and 60% W. Relative densities and tensile strength generally decline with the W content rising, and the maximum tensile strength of Mo-20W alloy is 514.83 MPa at the sintering temperature of 1990. With the increase of sint℃ ering temperature, the tensile strength of low-tungsten-content alloy (W content by mass: 20%~40%) increases first and then decreases, while the high-tungsten-content alloy (W content by mass: 60%~80%) increases gradually. The failure mode of Mo-W alloy is the mixture of intergranular fracture and transgranular fracture.
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Key words:
- Mo-W alloy /
- sintering temperature /
- microstructure /
- mechanical properties
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图 3 W质量分数与烧结温度对Mo-W合金相对密度与晶粒尺寸的影响:(a)W质量分数与烧结温度对Mo-W合金相对密度的影响;(b)W质量分数对1990 ℃烧结Mo-W合金相对密度与晶粒尺寸的影响;(c)烧结温度对Mo-20W合金相对密度与晶粒尺寸的影响;(d)烧结温度对Mo-70W合金相对密度与晶粒尺寸的影响
Figure 3. Effects of W content by mass and sintering temperature on the relative density and grain size of Mo-W alloys: (a) the relationship of W content by mass, sintering temperature, and relative density of the Mo-W alloy; (b) the relationship of W content by mass, relative density, and grain size of Mo-W alloy sintered at 1990 ℃; (c) the relationship of sintering temperature, relative density, and grain size of the Mo-20W alloy; (d) the relationship of sintering temperature, relative density, and grain size of the Mo-70W alloy
表 1 原料粉与混合粉的氧含量(质量分数)与费氏粒度
Table 1. Fsss and oxygen content by mass of the raw powders and the mixed powders
原料粉与混合粉 W质量分数/% 费氏粒度/μm O质量分数/% Mo — 2.79 0.1800 Mo-20W 20 2.75 0.1938 Mo-30W 30 2.73 0.1747 Mo-40W 40 2.77 0.1734 Mo-50W 50 2.74 0.1486 Mo-60W 60 2.78 0.1593 Mo-70W 70 2.78 0.1407 Mo-80W 80 2.83 0.1475 W — 2.80 0.1100 -
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