Simultaneously improving the strength and ductility of the as-sintered (TiB+La2O3)/Ti composites by in-situ planting ultra-fine networks into the composite powder
Simultaneously improving the strength and ductility of the as-sintered (TiB+La2O3)/Ti composites by in-situ planting ultra-fine networks into the composite powder
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通过在复合材料粉末中原位植入超细网络，同时提高烧结态 (TiB La2O3)/Ti 复合材料的强度和延展性
DOI：
10.1016/j.scriptamat.2022.114835
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发表时间：
2022-09
影响因子：
6
通讯作者：
Weijie Lu
中科院分区：
文献类型：
--
作者：
Shaopeng Li;Xiaoyan Wang;Zichao Wei;Yuanfei Han;Huigang Shi;Jianwen Le;Guangfa Huang;Di Zhang;Weijie Lu
本研究创造性地提出了一种通过在复合粉末中原位植入TiB纳米纤维和La 2 O3纳米颗粒作为超细网络来有效克服烧结态钛基复合材料的强度-塑性失配的技术。(TiB采用热压法制备了具有优异强韧性协同效应的Ti/La 2 O3复合材料。超细网络消除了魏氏组织，并发挥了显着的细晶效应。因此，烧结态的1.2体积% (TiB+La 2 O3）/Ti复合材料的抗拉强度由基体合金的2.2%提高到10.8%，同时抗拉强度也提高到1098.6MPa。同时，2.4体积%的拉伸强度(TiB+La 2 O3）/Ti复合材料在600 °C时的抗压强度达到774.8MPa，甚至上级于许多锻造复合材料。强塑性协同效应主要归因于显著的细晶效应和纳米增强体与软基体之间的协同效应。该研究为直接烧结制备综合性能良好的纳米颗粒增强钛基复合材料构件开辟了一条新的途径。
This study creatively proposed a technique to effectively overcome the strength-ductility mismatch of the as-sintered titanium matrix composites by in-situ planting TiB nano-fibers and La 2 O 3 nano-particles as ultra-fine networks into the composite powder. (TiB+La 2 O 3 )/Ti composites with excellent strength-ductility synergy were fabricated by hot pressing. The ultra-fine network eliminated the Widmanstatten microstructure and exerted a significantly fine-grain effect. Thus, the elongation of the as-sintered 1.2 vol.% (TiB+La 2 O 3 )/Ti composite was significantly improved from 2.2 to 10.8% compared with the matrix alloy, and the ultimate tensile strength was simultaneously enhanced to 1098.6 MPa. Meanwhile, the tensile strength of 2.4 vol.% (TiB+La 2 O 3 )/Ti reached 774.8 MPa at 600 °C, even superior to many wrought composites. The strength-ductility synergy effects were mainly attributed to the significant fine-grain effect and the synergistic effect between nano-reinforcements and soft matrix. This work opened up a new route for directly sintering nanoparticles reinforced titanium matrix composites components with promising comprehensive properties.
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