Effect of Interface on Mechanical Properties and Stamping Formability of Ti/Al Multilayered Composites

Miao Cao; Hui‑Qin Chen; Kun‐Kun Deng; Xing‑Wang Duan; Shuang Liu; Xin Che; Fei Li

doi:10.1007/s12540-022-01299-1

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자료유형: 학술저널

저자정보: Miao Cao (Taiyuan University of Science and Technology) Hui‑Qin Chen (Taiyuan University of Science and Technology) Kun‐Kun Deng (Taiyuan University of Technology) Xing‑Wang Duan (Taiyuan University of Science and Technology) Shuang Liu (Taiyuan University of Science and Technology) Xin Che (Taiyuan University of Science and Technology) Fei Li (Taiyuan University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.5

발행연도: 2023.5

수록면: 1,469 - 1,488 (20page)

DOI: 10.1007/s12540-022-01299-1

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Ti/Al multilayered composites (LMCs) with 3-layers, 5-layers and 7-layers were prepared by hot‐pressing and hot‐rolling. Theeffects of the interface on the mechanical properties and stamping formability of LMCs were revealed. The results indicatethat the TiAl3phases at the interface thicken gradually with the increase of layers. As the layers of LMCs increases, boththe grain size and the basal texture strength of Ti decrease, and Ti possesses a higher Schmid factors (SF) and more uniformSF distribution, which promotes the overall coordinated deformation of LMCs. The elongation (EL) of LMCs graduallyincreases at the expense of the strength with the increase of layers. The stress–strain transfer across the interface, the releaseof residual stress through interfacial microcracks, and the improvement of the interfacial metallurgical bonding strengthare all conducive to the coordinated deformation between Ti and Al layers, thus the strength of LMCs decreases and theEL enhances. Both the yield strength ratio (σs/σb) and plastic strain ratio (r) decrease, while the strain-hardening exponent(n) increases with the increase of layers of LMCs, which are beneficial to improve the stamping formability of LMCs. Thenumber of interface increases with the increase of layers, which hinders crack propagation. Moreover, the microcracks areeasily induced by the brittle TiAl3phase at the interface, and the main cracks deflect obviously and release part energy inthe form of secondary microcracks, thus delaying the failure of LMCs and improving their stamping formability.

#Hot-pressing · Hot‐rolling · Interface · Mechanical properties · Stamping formability

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