An improved shielding structure of a bumper that constructed from Ti/Al/Mg density-graded materials was presented. Two types of Ti/Al/Mg density-graded materials with the same areal density were prepared by diffusion bonding and powder metallurgy, respectively. The characteristics of hypervelocity impact including penetration holes in the bumper, damage patterns on the rear wall and micrographs of the crater were investigated. The results show that damage mechanism of Ti/Al/Mg density-graded materials is closely related to the interface bonding strength and matrix strength. The penetration holes of Ti/Al/Mg density-graded material obtained by diffusion bonding exhibit typical ductile characteristics. The Ti/Al/Mg density-graded material prepared by powder metallurgy shows significant mechanical synergistic response under high strain compression and appears fragile characteristic. The shielding performance of Ti/Al/Mg bumper is increased by 20.4% compared with aluminum bumper. A theoretical analysis suggests that a Ti-Al-Mg bumper can fully break the projectile and greatly increase the entropy during the impact process. Larger projectile kinetic energy is converted into the internal energy during the impact process, thereby causing an obvious increase in shielding performance.

中文翻译：

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Ti / Al / Mg密度梯度材料的超高速冲击特性研究

提出了一种由Ti / Al / Mg密度梯度材料制成的保险杠的改进屏蔽结构。通过扩散结合和粉末冶金分别制备了两种具有相同面密度的Ti / Al / Mg密度梯度材料。研究了超高速冲击的特征，包括保险杠上的穿透孔，后壁上的损坏方式以及弹坑的显微照片。结果表明，Ti / Al / Mg密度梯度材料的损伤机理与界面结合强度和基体强度密切相关。通过扩散结合获得的Ti / Al / Mg密度梯度材料的通孔表现出典型的韧性。通过粉末冶金制备的Ti / Al / Mg密度梯度材料在高应变压缩下显示出显着的机械协同响应，并表现出脆性。与铝制保险杠相比，Ti / Al / Mg保险杠的屏蔽性能提高了20.4％。理论分析表明，Ti-Al-Mg保险杠可以完全破坏弹丸，并在撞击过程中极大地增加熵。在撞击过程中，较大的射弹动能会转换为内部能，从而显着提高屏蔽性能。理论分析表明，Ti-Al-Mg保险杠可以完全破坏弹丸，并在撞击过程中极大地增加熵。在撞击过程中，较大的射弹动能会转换为内部能，从而显着提高屏蔽性能。理论分析表明，Ti-Al-Mg保险杠可以完全破坏弹丸，并在撞击过程中极大地增加熵。在撞击过程中，较大的射弹动能会转换为内部能，从而显着提高屏蔽性能。