Simultaneously improving strength and ductility of laser-powder-bed-fused Al–Zn–Mg–Cu–Ti alloys by controlling phase structure of Al₃Ti

Titanium (Ti) addition enabled the laser-powder-bed-fusion (LPBF) fabrication of 7075 (Al–Zn–Mg–Cu) alloys under the heterogeneous nucleation effect of in-situ Al₃Ti phase. However, brittle D0₂₂ structured Al₃Ti easily formed during LPBF, leading to unpleasant tensile properties. In this study, suppression of D0₂₂–Al₃Ti was explored by adding a small amount of carbon (C) in LPBF Al–Zn–Mg–Cu–Ti alloys. It was found that C addition resulted in 118% improvement in elongation and simultaneous 23% improvement in ultimate tensile strength. The effect of C on the L1₂ → D0₂₂ transformation was studied by aberration-corrected transmission electron microscope and density functional theory.

借助原位Al₃Ti相（Al₃Ti phase）的异质形核作用，添加钛（Titanium, Ti）可实现7075铝合金（Al-Zn-Mg-Cu合金）的激光粉末床熔融（laser-powder-bed-fusion, LPBF）制备。然而，在激光粉末床熔融过程中极易生成脆性的D0₂₂结构Al₃Ti相（D0₂2 structured Al₃Ti），进而导致拉伸性能不佳。本研究通过在激光粉末床熔融用Al-Zn-Mg-Cu-Ti合金中添加少量碳（Carbon, C），探究了D0₂2结构Al₃Ti相的抑制方法。研究发现，添加碳可使断后伸长率提升118%，同时使极限抗拉强度提升23%。本研究通过像差校正透射电子显微镜（aberration-corrected transmission electron microscope）与密度泛函理论（density functional theory），探究了碳对L1₂结构（L1₂ structure）向D0₂2结构转变的影响。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于激光粉末床熔融Al-Zn-Mg-Cu-Ti合金的研究，通过添加少量碳来抑制脆性D022结构Al3Ti相的形成，从而同时提高合金的强度和延展性。实验结果显示，碳添加使伸长率提升118%，极限抗拉强度提高23%，数据集包含相关实验数据、图像和理论分析，适用于材料科学领域的合金优化研究。