樊振中 1王佶 2李鸿标 2李世德 2田艳中 3杨守杰1
作者信息
- 1. 中国航发北京航空材料研究院,北京 100095||北京市先进铝合金材料及应用工程技术研究中心,北京 100095
- 2. 中信戴卡股份有限公司,河北秦皇岛 066000
- 3. 东北大学材料科学与工程学院,沈阳 110167
- 折叠
摘要
Abstract
The Al-6Si-0.75Mg-0.2Sc-0.15Zr-0.12Sb alloy is prepared using the smelting process.This study investigates the impacts of solution and aging temperatures,as well as their durations,on the microstructure and mechanical properties of the alloy.Additionally,it analyzed the morphology,size,and distribution of Si and precipitated phases.It is observed that the as-cast microstructure comprises α-Al,eutectic Si,Mg2Si,Al3Sc,and Al3(Sc,Zr)phases.As the solution and aging temperatures and times increase,the morphology of the Si phase transforms from plate-like and fibrous to worm-like and nearly spherical.Prolonged holding times lead to the segregation and coarsening of the Si phase,which turns into short rod-like structures.The tensile strength and elongation initially rise and then decline with increasing solution temperature.During single-stage aging at 170 ℃,the strength and hardness first increase and then decrease with the extension of the holding time,eventually reaching a stable state.The interface between the β"and α-Al phases evolves from coherent to semi-coherent and then incoherent,and the fracture mechanism shifts from intergranular fracture to typical dimple fracture.Pre-aging at 110 ℃ promotes the precipitation of β"and Al3(Sc,Zr)phases,significantly spheroidizes the morphology of the Si phase,and refines its size.The length and precipitated surface density of the β" phases are(29±1.8)nm and 3.52 × 103 μm-2,respectively.After dual-stage aging at 110 ℃/2 h+170 ℃/6 h,the tensile strength,yield strength,and elongation can reach 363,301 MPa,and 7.9％,respectively.关键词
Al-6Si-0.75Mg-0.2Sc-0.15Zr-0.12Sb合金/热处理/显微组织/时效强化/力学性能Key words
Al-6Si-0.75Mg-0.2Sc-0.15Zr-0.12Sb alloy/heat treatment/microstructure/aging strengthening/mechanical property分类
矿业与冶金
