冷拉变形和退火温度对Al-Si-Sc-Zr合金丝材组织及拉伸性能的影响  

Influence of cold drawing deformation and annealing temperature on microstructure and tensile properties of Al-Si-Sc-Zr alloy wires

作　　者：郑涛 施瀚超 陈冰清 熊华平 ZHENG Tao;SHI Hanchao;CHEN Bingqing;XIONG Huaping(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095

出　　处：《材料工程》2025年第4期91-97,共7页Journal of Materials Engineering

摘　　要：采用电子背散射衍射技术研究不同冷拉变形量和退火温度对Al-Si-Sc-Zr合金丝材组织及力学性能的影响。结果表明:随着冷拉变形量的增加,晶粒沿着拉拔方向被拉长、细化并形成纤维状组织和典型的〈111〉形变织构。但当变形量由0.61增至0.76时,晶粒内部发生再结晶行为导致晶粒尺寸增加及小角度晶界占比锐减。此外,冷拉变形产生的加工硬化,使得丝材的抗拉强度达到181.5 MPa,屈服强度达到166.5 MPa。当冷拉态丝材在350~450℃退火保温2 h后,纤维状的冷拉态组织转化为细小的等轴晶并形成了典型的立方织构{100}〈001〉。上述退火工艺能够显著消除冷拉产生的加工硬化,屈服强度由166.5 MPa降至84.0 MPa,而断后伸长率由2.1%增至9.5%,退火态组织均匀且稳定,有利于后续的冷拉拔加工。The effect of different cold drawing deformations and annealing temperatures on the microstructure and tensile properties of Al-Si-Sc-Zr alloy wires is investigated by the mean of electron backscatter diffraction technique.The results show that the grains are elongated and refined along the drawing direction,accompanying with the fibrous structure and a typical〈111〉deformation texture with strain increasing.However,when the drawing strain increases from 0.61 to 0.76,the average grain size increases and the proportion of low-angle grain boundaries decreases due to the recrystallization behavior in the grains.Furthermore,the tensile strength and yield strength of the wire increase to 181.5 MPa and 166.5 MPa,respectively,due to the work hardening induced by the cold drawing process.When the colddrawn wires are subjected to the annealing treatment at 350-450℃for 2 h,the fibrous cold-drawn structure is transformed into fine equiaxed grains,and the typical cube texture{100}〈001〉is formed.This annealing treatment can significantly eliminate the work hardening caused by the cold drawing.In this case,the yield strength decreases from 166.5 MPa to 84.0 MPa,meanwhile the elongation after fracture increases from 2.1%to 9.5%.The annealed structure is uniform and stable,which is favorable to subsequent cold drawing processes.

关 键 词：Al-Si-Sc-Zr合金丝材 冷拉 退火温度 组织 织构 拉伸性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TB31[金属学及工艺—合金]