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Microstructure and mechanical properties of Al_2O_3 dispersed fine-grained medium heavy alloys with a superior combination of strength and ductility

机译:Al_2O_3分散的细粒介质重合金具有优异的强度和延展性的微观结构和机械性能

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摘要

The medium W content W-Ni-Fe alloys have a combination of high strength and great ductility, revealing a promising future for widespread engineering applications. In order to fabricate medium W content W-Ni-Fe alloys with outstanding performances, W nano-powders prepared by a two-stage reduction method was employed as raw material. Meanwhile, the finely dispersed Al_2O_3 particles have effective roles in restraining the growth of W grain. Electron back-scattered diffraction analysis identified that fine W grains were uniformly distributed in the y matrix phase without any observable texture. Benefitting from the combination of fine-grain strengthening, oxide dispersion strengthening and precipitation strengthening, a highest tensile strength of 816 ±11 MPa and a greatest elongation of 29.7 ± 1.2% are obtained for the sintered alloys of 75 W-1Al_2O_3 and 50 W, respectively. It is also concluded that the main fracture modes of the currently manufactured alloys are ductile matrix rupture and W-matrix interface separation.
机译:培养基W含量W-Ni-Fe合金具有高强度和延展性的组合,揭示了广泛的工程应用的有希望的未来。为了制造具有优异性能的介质W含量W-Ni-Fe合金,通过两阶段还原方法制备的W纳米粉末作为原料。同时,精细分散的Al_2O_3颗粒具有有效的作用,抑制W粒的生长。电子背散射衍射分析鉴定为均匀分布在Y基质相中没有任何可观察的纹理。从细粒强化,氧化物分散率强化和沉淀强化的组合,为75W-1AL_2O_3和50W的烧结合金获得的最高拉伸强度为816±11MPa和29.7±1.2%的最大伸长率。分别。还得出结论,目前制造合金的主要断裂模式是延展岩基质破裂和W矩阵界面分离。

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