论文部分内容阅读
通过拉伸实验,OM,SEM,TEM观察以及EBSD测试等手段研究了不同尺寸粒子对Al-Mg-Si-Cu系合金板材力学性能、组织和织构的影响规律.结果表明,随着溶质元素浓度的增加,合金屈服强度和抗拉强度均不断增加,但是延伸率却略有降低,且3个方向存在一定差异.此外,合金的平均塑性应变比rˉ也随溶质元素浓度增加而增加.3种合金基体内的不同尺寸粒子主要为Mg2Si,Al15Mn3Si2和a-Al(Fe,Mn)Si富铁相,这些粒子尺寸和浓度搭配合理不仅可以诱发粒子刺激形核效应(particle stimulated nucleation,简称PSN),而且可有效抑制晶粒长大,最终使得合金固溶时形成大量细小再结晶晶粒,而织构组分以旋转立方织构CubeND18,Goss织构{011}<100>,P{011}<122>和Cu{112}<111>为主.此外,根据合金成分、热加工工艺以及显微组织间的定量关系提出了不同尺寸粒子影响再结晶形核和长大过程的模型示意图.
The effects of different size particles on the mechanical properties, microstructure and texture of Al-Mg-Si-Cu alloy sheets were investigated by tensile test, OM, SEM, TEM observation and EBSD test. The results showed that with the increase of solute elements The increase of concentration, the yield strength and the tensile strength of the alloy all increase, but the elongation is slightly lower, and there are some differences in the three directions.In addition, the average plastic strain ratio r ˉ of the alloy also increases with the increase of solute concentration.3 The particles of different sizes in the alloy matrix are mainly Mg2Si, Al15Mn3Si2 and a-Al (Fe, Mn) Si iron-rich phase. The combination of particle size and concentration can not only induce particle stimulated nucleation (PSN) , And can effectively restrain grain growth, finally make the alloy form a large number of fine recrystallized grains when the alloy is dissolved in solution, and the texture components take the cubic structure CubeND18, Goss texture {011} <100>, P {011} <122> and Cu {112} <111> In addition, according to the alloy composition, the thermal processing technology and the quantitative relationship among the microstructures, a model schematic diagram of different size particles influencing recrystallization nucleation and growth process was proposed.