Microstructure and Mechanical Properties of TiC-Reinforced Al-Mg-Sc-Zr Composites Additively Manufactured by Laser Direct Energy Deposition
Microstructure and Mechanical Properties of TiC-Reinforced Al-Mg-Sc-Zr Composites Additively Manufactured by Laser Direct Energy Deposition
复制标题
激光直接能量沉积增材制造 TiC 增强 Al-Mg-Sc-Zr 复合材料的微观结构和力学性能
DOI：
10.1007/s40195-021-01309-y
复制
发表时间：
2022
影响因子：
3.5
通讯作者：
Li Ping
中科院分区：
文献类型：
--
作者：
Xu Rong;Li Ruidi;Yuan Tiechui;Zhu Hongbin;Li Ping
为了细化Al-Mg-Sc-Zr合金的组织，提高其性能，采用直接能量沉积（DED）法制备了TiC改性Al-Mg-Sc-Zr复合材料，并研究了TiC含量对其组织和性能的影响。在不添加TiC颗粒的情况下，DED法制备的Al-Mg-Sc-Zr合金的显微组织为平均尺寸为8.36 μm的细小晶粒，晶粒内分布良好的纳米al_3 （Sc,Zr）颗粒和沿晶界分布的Mg_2 Si相。TiC添加量为1 wt%时，DED法制备的TiC/Al-Mg-Sc-Zr的微观结构明显细化；当TiC含量进一步增加到3 wt%时，DED法制备的TiC/Al-Mg-Sc-Zr的微观结构变得粗糙，出现了一种新型针状（Ti,Zr）_5 Si_3相。TiC的加入降低了DED法制备的Al-Mg-Sc-Zr的孔隙率。同时，加入TiC后，拉伸强度由283.25 MPa提高到344.98 ~ 361.51 MPa，伸长率由3.61%提高到9.58 ~ 14.10%。探讨了微观组织演变和强度提高的潜在机理。该研究将为激光增材制造（LAM）的金属基复合材料提供新的见解。
In order to refine the microstructure and improve the performance of direct energy deposited (DED) additively manufactured Al-Mg-Sc-Zr alloy, TiC-modified Al-Mg-Sc-Zr composites were prepared by DED and the effect of TiC content on the microstructure and performance was studied. In the absence of TiC particle, the microstructure of Al-Mg-Sc-Zr alloy prepared by DED consisted of fine grains with average size of 8.36 μm, and well-dispersed nano-Al_3 (Sc,Zr) particles inside the grains and Mg_2 Si phase along the grain boundaries. With the addition of 1 wt% TiC, the microstructure of TiC/Al-Mg-Sc-Zr prepared by DED became finer apparently compared with that without TiC; while the further increase of TiC content to 3 wt%, the microstructure of TiC/Al-Mg-Sc-Zr prepared by DED became coarser with appearance of a new kind of needle-like (Ti,Zr)_5 Si_3 phase. Also, the addition of TiC decreased the porosity of Al-Mg-Sc-Zr prepared by DED. Simultaneously, after the addition of TiC, the tensile strength increased from 283.25 MPa to 344.98-361.51 MPa, and the elongation increased from 3.61% to 9.58-14.10%. The potential mechanism of the microstructure evolution and strength improvement was discussed. This research will provide new insights into the available metal matrix composites by laser additive manufacturing (LAM).