Effect of holding time on the microstructure and mechanical properties of TC11 framework reinforced WE43 matrix composites
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摘要: 研究设计了三维连通结构的TC11（Ti-6.5Al-3.5Mo-1.5Zr-0.3Si）合金框架作为增强体，采用粉末冶金结合无压浸渗技术制备了WE43基复合材料。微观结构表明，复合材料内部的TC11框架增强体呈现连续均匀地分布，框架内部孔隙区域被WE43基体充分填充，形成了TC11/WE43三维连通的稳定结构。同时，复合材料界面处通过扩散反应形成了纳米尺度的Al2Y过渡层，提升了界面结合强度。力学性能测试结果表明，当保温时间为30 min时，TC11/WE43复合材料展现出最佳的综合力学性能，其屈服强度（YS）、抗拉强度（UTS）和延伸率（EL）分别达到417、438 MPa和6.6%，其强度的提升来源于高仿生结构的TC11框架所起的载荷传递作用以及优异的界面结合强度。Abstract: This study designed a three-dimensional interconnected TC11 alloy framework as a reinforcement and prepared WE43-based composites using powder metallurgy combined with pressureless infiltration technology. Microstructural analysis shows that the TC11 framework reinforcement within the composite is continuously and uniformly distributed, and the pore regions inside the framework are fully filled with the WE43 matrix, forming a stable three-dimensional interpenetrating structure of TC11/WE43. At the same time at the interface of the composite material, a nanoscale Al2Y transitional layer is formed through diffusion reaction, which enhances the interfacial strength. Mechanical performance test results indicate that when the holding time is 30 minutes, the TC11/WE43 composite material exhibits the best overall mechanical properties, with a yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of 417 MPa, 438 MPa, and 6.6%, respectively. The improvement in strength is attributed to the load transfer effect of the highly biomimetic TC11 framework and the excellent interfacial bonding strength.
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图 3 不同保温时间下TC11/WE43复合材料形貌
（a）0 min；（b）30 min；（c）60 min
Figure 3. Morphology of TC11/WE43 composite under different holding times
图 4 30 min保温TC11/WE43复合材料的元素分布
（a）形貌图；（b）Mg；（c）Ti；（d）Al；（e）Y；（f）Mo
Figure 4. Element distribution maps of TC11/WE43 composite material after 30 min of insulation
图 5 不同保温时间制备的TC11/WE43复合材料XRD图
Figure 5. XRD patterns of TC11/WE43 composites prepared with different heat preservation times
图 6 保温30 minTC11/WE43复合材料界面处透射图
（a）线扫描；（b）明场像；（c）界面处高分辨图
Figure 6. Transmission images at the interface of TC11/WE43 composite after 30 min holding
图 7 不同保温时间下复合材料拉伸应力-应变曲线
Figure 7. Tensile stress-strain curves of composites under different curing times
图 8 不同保温时间下复合材料纳米压痕数据
载荷位移曲线：（a）不保温, （b）保温30 min, （c）保温60 min, （d）界面结合处；（e）硬度和弹性模量；（f）界面处塑性功和总功
Figure 8. Nanoindentation data of composite materials under different insulation times
图 9 不同保温时间下复合材料拉伸断口形貌
（a）不保温；（b）保温30 min；（c）保温60 min
Figure 9. Fracture morphology images of composite materials under different insulation times
表 1 TC11颗粒和WE43具体成分
Table 1. Specific compositions of TC11 granules and WE43
% Material Mg Ti Al Y Mo Nd Zr WE43 Bal. 4.01 3.04 0.51 TC11 Bal. 6.5 3.5 1.5 
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表 2 不同保温时间复合材料力学性能
Table 2. Stretching performance at different insulation times
Holding time/min Yield strength/MPa Ultimate tensile
strength/MPaElongation after
fracture/%Hardness at the
interface/GPaElastic modulus/GPa 0 369 1 4.17 120 30 417 438 6.6 5.9 165 60 446 473 5.5 6.58 176
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