针对激光粉末床增材制造制备7075铝合金易发生凝固开裂的问题，提出通过微米SiC陶瓷颗粒诱导原位反应调控熔池凝固特性，优化成形质量并提升力学性能。结合激光粉末床与机械混粉制备不同SiC含量（0~8 wt.%）7075铝基复合材料，系统研究SiC颗粒对微观组织、裂纹抑制及力学性能的影响。结果表明，SiC颗粒与铝基体发生原位反应生成Al4C3、Al4SiC4、Si及Mg2Si等相，沿晶界形成网状亚结构提高相邻晶粒的结合强度，从而降低开裂敏感性。微米SiC陶瓷颗粒与纳米Al4C3、Al4SiC4、Mg2Si、Si析出相协同强化力学性能，SiC含量为6 wt.%时，裂纹完全消失，抗拉强度提升至307.0 ± 37.0 MPa，延伸率为5.0 ± 0.3 %。随着SiC含量增至8 wt.%，显微硬度达161.4 ± 10.5 HV0.1，但过量SiC导致塑性下降至3.5 ± 0.4 %。本研究验证了微米级陶瓷颗粒调控激光增材制造7075铝合金成形、组织及性能的可行性，为实现高强7075铝合金及其复合材料低成本增材制造提供借鉴。

This study centers on mitigating solidification cracking in laser powder bed fusion (LPBF) processed 7075 aluminum alloys. An in-situ reaction strategy employing SiC ceramic particles was introduced to modify molten pool solidification behavior, aimed at enhancing formability and mechanical properties. 7075 aluminum matrix composites with varying SiC contents (0-8 wt.%) were fabricated using LPBF combined with mechanical mixing. The influence of SiC particles on microstructural evolution, crack suppression mechanisms, and mechanical performance was systematically examined. Results revealed that in-situ reactions between SiC particles and the aluminum matrix generated Al4C3, Al4SiC4, Si, and Mg2Si phases. These phases formed intergranular network structures that fortified grain boundaries and diminished cracking susceptibility.The synergistic strengthening from micron-sized SiC particles and nano-scale precipitates (Al4C3, Al4SiC4, Si, Mg2Si) substantially improved mechanical properties. At 6 wt.% SiC content, solidification cracking was entirely eliminated, with tensile strength achieving 307.0 ± 37.0 MPa and elongation improving to 5.0 ± 0.3%. Further increasing SiC content to 8 wt.% yielded a microhardness of 161.4 ± 10.5 HV0.1, although ductility diminished to 3.5 ± 0.4% due to excessive particle content. This research demonstrates the feasibility of micro-scale ceramic particles in regulating the formability, microstructure, and properties of LPBF-processed Al-Zn-Mg-Cu alloys, offering significant implications for economical additive manufacturing of high-strength aluminum alloys.