Abstract In order to optimize the mechanical properties of the as-sintered TiBw/TA15 composite with a network architecture, multi-directional forging was carried out at near β-transus temperatures. The effects of the multi-directional forging on the mechanical behavior of the composite were investigated. The ultimate tensile strength (UTS) and the maximum elongation exhibited a homogeneous distribution in the forged samples, and at ambient temperature, showed increases of 8.4% and 160%, respectively, when compared to those of the as-sintered composite. The microstructures of samples cut from different positions of the forged workpiece were observed by scanning electron microscopy (SEM). The reinforcement retained the three-dimensional (3D) network in the overall workpiece, although the network units suffered deformation in different directions and were slightly flattened. The microstructures of the matrix were composed of a primary α phase (αp) and transformed β phase (βt) consisting of lamellas/needles of a secondary α phase (αs) and residual β phase. The yield stress (YS) of the composite increased with increasing volume fraction of βt and the proportion of low-angle grain boundaries (LAGBs). The above results revealed that the as-forged microstructure did not show any significant variation with orientation, leading to uniform and improved mechanical properties of the composite.

中文翻译：

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多向锻造对具有网络结构的TiBw/TA15复合材料组织和力学性能的影响

摘要 为了优化具有网络结构的烧结态 TiBw/TA15 复合材料的力学性能，在接近 β-transus 温度下进行多向锻造。研究了多向锻造对复合材料力学行为的影响。极限拉伸强度 (UTS) 和最大伸长率在锻造样品中表现出均匀分布，并且在环境温度下，与烧结复合材料相比，分别增加了 8.4% 和 160%。通过扫描电子显微镜（SEM）观察从锻造工件不同位置切取的试样的显微组织。钢筋在整个工件中保留了三维（3D）网络，尽管网络单元在不同方向发生变形并略微变平。基体的显微组织由初生 α 相 (αp) 和转变的 β 相 (βt) 组成，由次生 α 相 (αs) 和残余 β 相的薄片/针组成。复合材料的屈服应力 (YS) 随着 βt 的体积分数和低角度晶界 (LAGB) 比例的增加而增加。上述结果表明，锻造态的微观结构没有显示出任何显着的取向变化，导致复合材料的均匀和改善的机械性能。复合材料的屈服应力 (YS) 随着 βt 的体积分数和低角度晶界 (LAGB) 比例的增加而增加。上述结果表明，锻造态的微观结构没有显示出任何显着的取向变化，导致复合材料的均匀和改善的机械性能。复合材料的屈服应力 (YS) 随着 βt 的体积分数和低角度晶界 (LAGB) 比例的增加而增加。上述结果表明，锻造态的微观结构没有显示出任何显着的取向变化，导致复合材料的均匀和改善的机械性能。