摘要
通过硬度测试、拉伸测试和透射电镜分析等研究了不同预变形与预时效工艺对Al-Cu铝合金断续时效T9I6态的微观组织与力学性能的影响。结果表明:当预变形从10%提高到30%时,可以显著提高T9I6态2519A铝合金的硬度和强度;而当预变形增加到40%时,合金的强度提升不明显。延长预时效时间,不能促进合金力学性能的提高。合金的最佳预变形量在20%~30%之间,预时效时间在2 h以内,此时合金的抗拉强度为530 MPa、屈服强度为495 MPa、伸长率为12.5%。适当提高预变形量可以有效地改善θ′析出相的尺寸和分布,并提高加工硬化效果,提高合金的强度。延长预时效时间,消耗了合金中的过饱和溶质原子,影响了低温时效中析出相的析出,对合金的力学性能不利。
The effects of different pre-deformation and pre-aging processes on microstructure and mechanical properties of interrupted aged Al-Cu aluminum alloy were studied by means of hardness test, tensile test and transmission electron microscopy. The results show that when the pre-deformation increases from 10% to 30%, the hardness and strength of the interrupted aged 2519 A aluminum alloy can be significantly improved, and when the pre-deformation is increased to 40%, the strength increment of the alloy is not obvious. The mechanical properties of the alloy are not improved with the increase of pre-aging time. The optimum pre-deformation of the alloy is between 20% and 30%, and the pre-aging time is within 2 h, and at this time, the tensile strength of the alloy is 530 MPa, the yield strength is 495 MPa, and the elongation is 12.5%. Appropriately increasing the amount of pre-deformation can effectively improve the size and distribution of the θ′ precipitates, and improve the work hardening effect and the strength of the alloy. Prolonging the pre-aging time will make the supersaturated solute atoms in the alloy decrease and disappear, which will affect the precipitation of the precipitated phase in the low temperature aging and be unfavorable to the mechanical properties of the alloy.
作者
陈颖欣
石常亮
胡权
蔡知之
CHEN Ying-xin;SHI Chang-liang;HU Quan;CAI Zhi-zhi(Guangdong Industrial Analysis and Testing Center,Guangzhou 510650,China;Guangdong Fenglv Alumina Co Ltd,Foshan 528133,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2020年第11期38-45,共8页
Transactions of Materials and Heat Treatment
基金
广东省自然科学基金(2018A030310417)
广东省科学院科技项目(2019GDASYL-030209)
广州市对外科技合作计划项目(No.201907010004)。
关键词
T9I6断续时效
预变形
预时效
力学性能
显微组织
T9I6 interrupted aging
pre-deformation
pre-aging
mechanical property
microstructure
