钛网添加对镁/铝复合板微观组织和力学性能影响研究

目的 有效抑制镁/铝复合板界面处金属间化合物的形成。以钛网为中间金属夹层，研究它对镁/铝复合板微观组织和力学性能的影响。方法 利用复合轧制技术制备以钛网为中间金属夹层的镁/铝-钛复合板，采用扫描电子显微镜(SEM)、电子背散射衍射仪(EBSD)、万能试验机等对复合板退火前后的微观组织和力学性能进行表征和分析，系统研究中间层钛网对轧制态和退火态复合板微观组织、织构、拉伸性能、界面结合强度的影响规律。结果 中间层钛网均匀分布在镁/铝-钛复合板界面处，钛网的添加能有效抑制复合板退火过程中镁-铝金属间化合物的连续生长，减少金属间化合物的数量。与镁/铝复合板相比，钛网的添加对轧制态和退火态复合板中镁层和铝层的平均晶粒尺寸和织构类型的影响较小。与镁/铝复合板相比，钛网的添加降低了轧制态复合板的界面剪切强度和延伸率，但极大提升了退火态复合板的界面剪切强度、拉伸强度和延伸率。结论 中间层钛网的添加可有效减少复合板界面处金属间化合物的数量，提升退火态复合板的综合力学性能。

Effect of Ti Mesh Addition on the Microstructure and Mechanical Properties of Mg/Al Composite Sheets

In order to effectively inhibit the formation of intermetallic compounds at the interface of Mg/Al composite sheet, the work aims to use Ti mesh as the intermediate metal interlayer to study its effect on the microstructure and mechanical properties of Mg/Al composite sheet. The Mg/Al-Ti composite sheet with Ti mesh as the intermediate metal interlayer was prepared by composite rolling. The microstructure and mechanical properties of the composite sheet before and after annealing were characterized and analyzed by scanning electron microscopy (SEM), electron back scattering diffraction (EBSD) and universal testing machine. The effects of Ti mesh interlayer on microstructure, texture, tensile properties and interface bonding strength of rolled and annealed composite sheet were studied. The Ti mesh interlayer was evenly distributed at the interface of Mg/Al-Ti composite sheet. The addition of Ti mesh could effectively inhibit the continuous growth of Mg-Al intermetallic compounds during the annealing process of composite sheet, and reduce the number of intermetallic compounds. The addition of Ti mesh had less effect on the average grain size and texture types of Mg and Al layers in rolled and annealed composite sheet than that in Mg/Al composite sheet. Compared with Mg/Al composite sheet, the addition of Ti mesh significantly reduced the interfacial shear strength and elongation of rolled composite sheet, but greatly increased the interfacial shear strength, tensile strength and elongation of annealed composite sheet. The addition of Ti mesh interlayer can effectively reduce the amount of intermetallic compounds at the interface of the composite sheet, and improve the comprehensive mechanical properties of the annealed composite sheet.