摘要
采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD),研究了固溶处理对流变压铸2024变形铝合金组织及硬度的影响。结果表明,流变压铸成形的2024变形铝合金在495℃固溶处理12 h后,共晶相θ(CuAl2)相和S(CuAl2Mg)相逐渐固溶进入α-Al基体内部,使得合金基体中的过饱和Cu、Mg合金元素的含量增多,对合金起到良好的固溶强化作用。而且,随着固溶时间的增加,流变压铸成形2024的组织中的初生颗粒与二次凝固区颗粒出现合并长大现象,其它们的长大速率都随固溶时间的延长而降低。
Effects of solution treatment on microstructure and hardness of 2024 wrought aluminum alloy by rheo-diecasting was investigated by means of optical microscopy （OM）, scanning electron microscopy（SEM） and X-ray diffraction（XRD）. The results show that when the rheo dieeast （RDC） 2024 wrought aluminum is solution-treated at 495 ℃ over 12 h, the eutectic 0（CuA12） phase and S（ CuA12Mg） phase are gradually solutioned into the a-A1 matrix, resulting in the increase of supersaturated Cu, Mg alloy element content in the alloy matrix, consequently the good solid solution strengthening of alloy is obtained. Furthermore, with the increasing of solution treatment time, the coalescent growth occurs for both the primary particles and the secondary solidification particles in the rheo-diecast 2024 alloy, and the growth rate decreases with the increase of solution time.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第9期57-63,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金项目(50964010
51064017)
甘肃省高等学校基本科研业务费(1201ZTC056)
关键词
2024变形铝合金
半固态
流变压铸
固溶
semi-solid
2024 wrought aluminum alloy
rheo-diecasting
solution treatment
