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本文研究的合金W、Nb、Ti等元素含量较高。其锻后热处理态组织为直径小于1μm的细颗粒状μ相和直径约为15nm的球状γ′相均匀分布在合金基体上,连续膜状相沿晶界分布。在室温和高温下,该合金都具有较高的屈服强度和断裂强度,这与合金的高W固溶强化和较高程度的γ′相沉淀强化有关。随着温度的升高,塑性下降,断口的沿晶断裂比例增大,表明晶界强度是限制合金高温拉伸性能的瓶颈因素。
The W, Nb, Ti and other elements studied in this paper have high content. After heat treatment, the as-prepared microstructure was composed of the fine-grained μ phase with a diameter of less than 1 μm and the spherical γ ’-phase with a diameter of about 15 nm uniformly distributed on the alloy matrix. The continuous film-like phase distributed along the grain boundary. At room temperature and high temperature, the alloy has a higher yield strength and fracture strength, which is related to the high W solid solution strengthening and the higher γ ’phase precipitation strengthening. With the increase of temperature, the plasticity decreases and the intergranular fracture ratio increases, which indicates that the grain boundary strength is the bottleneck factor that limits the high temperature tensile properties of the alloy.