Li Bowen, Xu Shanna, He Ni, Sun Guodong, Li Mingyang, Dong Longlong, Li Mingjia
School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China.
Xi'an Rare Metal Materials Institute Co., Ltd., Xi'an 710016, China.
Materials (Basel). 2024 Dec 26;18(1):51. doi: 10.3390/ma18010051.
One of the long-standing challenges in the field of titanium matrix composites is achieving the synergistic optimization of high strength and excellent ductility. When pursuing high strength characteristics in materials, it is often difficult to consider their ductility. Therefore, this study prepared a Ti1400 alloy and in situ synthesized TiC-reinforced (TiC + Ti1400)/TC4 composites using low-energy ball milling and spark plasma sintering technology, followed by hot rolling, to obtain titanium matrix composites with excellent mechanical properties. The Ti1400 alloy bonded well with the matrix, forming uniformly distributed Ti1400 regions within the matrix, and TiC particles were discontinuously distributed around the TiC-lean regions, forming a three-dimensional network structure. The (TiC + Ti1400)/TC4 composites effectively enhanced their yield strength to 1524 MPa by using 3 wt.% of Ti1400 alloy while preserving an impressive elongation of 9%. When the Ti1400 alloy content reaches 20 wt.%, the overall mechanical properties of the composites decrease. A small amount of Ti1400 does not reduce the strength of the composite. On the contrary, it can undergo stress-induced phase transformation during plastic deformation, thereby coordinating deformation, which not only provides higher strain hardening and increases tensile strength but also benefits ductility.
钛基复合材料领域长期存在的挑战之一是实现高强度和优异延展性的协同优化。在追求材料的高强度特性时，往往难以兼顾其延展性。因此，本研究制备了Ti1400合金，并采用低能球磨和放电等离子烧结技术原位合成了TiC增强的（TiC + Ti1400）/TC4复合材料，随后进行热轧，以获得具有优异力学性能的钛基复合材料。Ti1400合金与基体结合良好，在基体内形成均匀分布的Ti1400区域，TiC颗粒在贫TiC区域周围间断分布，形成三维网络结构。（TiC + Ti1400）/TC4复合材料通过使用3 wt.%的Ti1400合金有效地将其屈服强度提高到1524 MPa，同时保持了9%的可观伸长率。当Ti1400合金含量达到20 wt.%时，复合材料的整体力学性能下降。少量的Ti1400不会降低复合材料的强度。相反，它可以在塑性变形过程中发生应力诱导相变，从而协调变形，这不仅提供了更高的加工硬化并提高了拉伸强度，而且对延展性也有好处。
