摘要
采用超音速雾化制粉、球磨混粉、冷压烧结、挤压及中温锻造等工艺制备了不同变形量的SiC/Al-Cu复合材料,并对其进行热处理。结合微观组织表征与拉伸性能测试,系统研究了不同中温锻造变形量(0%、15%、20%和30%)对SiC/Al-Cu复合材料微观组织与力学性能的影响。结果表明,SiC/Al-Cu复合材料挤压棒中SiC颗粒分布均匀;随中温锻造变形量增加,动态再结晶程度提高,位错密度显著上升。经热处理后,材料发生明显再结晶和晶粒长大,几何必需位错密度显著降低,内应力得到释放,有助于塑性的改善。当变形量为20%时,热处理后材料表现出最优的综合性能:抗拉强度达524 MPa,伸长率为9.7%,强塑积(UTS×EL)为5082.8 MPa.%,性能较未锻造试样有显著提升。
SiC/Al-Cu composites with different deformation amounts were fabricated through a series of processes including supersonic atomization powder preparation,ball milling,cold pressing and sintering,extrusion,and medium-temperature forging,followed by heat treatment.The effect of various medium-temperature forging deformation amounts(0%,15%,20%,and 30%)on the microstructure and mechanical properties of the composites was systematically investigated by means of microstructural characterization and tensile testing.The results indicate that SiC particles are uniformly distributed in the extruded rods of the SiC/Al-Cu composites.With the increase of deformation during medium-temperature forging,the degree of dynamic recrystallization increases and the dislocation density rises significantly.After heat treatment,noticeable recrystallization and grain growth occur,accompanied by a marked reduction in geometrically necessary dislocation density and the release of internal stresses,which contribute to improved ductility.At a deformation level of 20%,the heat-treated material exhibits the optimum comprehensive properties with tensile strength of 524 MPa,elongation of 9.7%,and product of strength and elongation(UTS×EL)of 5082.8 MPa·%,respectively,representing a significant enhancement compared to the unforged specimen.
作者
马志锋
陈宗强
程利强
范宗荣
付祎磊
刘惠
Ma Zhifeng;Chen Zongqiang;Cheng Liqiang;Fan Zongrong;Fu Yilei;Liu Hui(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications,Beijing 100095,China)
出处
《金属热处理》
北大核心
2025年第12期145-154,共10页
Heat Treatment of Metals
