To better understand the strengthening mechanism of in-situ formed TiB reinforcements in dual-phase Ti6A14V alloy,the interface characters and properties of α-Ti/β-Ti/TiB system were thoroughly in-vestigated with the combined use of high-resolution transmission electron microscopy(HRTEM),ab-initio calculations,and indentation tests.The ab-initio calculations suggest that the highly coherent(100)TiB/((1)21)β-Ti phase boundary(PB)has fairly low interface energy of 0.082 J/m2 with an exceptionally high adhesion strength of 6.04 J/m2,owing to the formation of strong interfacial Ti-B ionic bonds.The semi-coherent(20(1))TiB/(00001)α-Ti interface shows a relatively higher interface energy of 1.442 J/m2 but still with a fairly high adhesion strength of 4.95 J/m2.With the obtained interfacial energetics,thermody-namics analyses were further carried out to explore the nucleation mechanism of α-Ti in TiB reinforced Ti6Al4V composite.Superior to the heterogeneous nucleation at TiB/β-Ti interface,the homogeneous nu-cleation of α-Ti within the β-Ti phase can be more energy-preferred,due to its lower nucleation energy barrier and critical radius.Further indentation tests under various loads of different modes confirmed a remarkably enhanced load-bearing capacity of dual-phase Ti6Al4V alloys,under the critical significance of the strong interfacial bonding achieved by reinforcements of in-situ formed TiB.

Qi An;Lujun Huang;Qi Qian;Yong Jiang;Shuai Wang;Rui Zhang;Lin Geng;Liqin Wang

School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,China

材料科学技术（英文版）

[1]Qi An;Lujun Huang;Qi Qian;Yong Jiang;Shuai Wang;Rui Zhang;Lin Geng;Liqin Wang-.Insights into in-situ TiB/dual-phase Ti alloy interface and its high load-bearing capacity)[J].材料科学技术（英文版）,2022(24):156-166

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