预轧制时效对2055铝锂合金组织和力学性能的影响
Effects of Pre-rolling Aging on Structure and Mechanical Properties of 2055 Al-Li Alloy
于培文 1边丽萍 2王鹏辉 1韩绍杰 1梁经韬1
作者信息
- 1. 太原理工大学材料科学与工程学院,太原 030024
- 2. 太原理工大学材料科学与工程学院,太原 030024;太原理工大学先进镁基材料山西省重点实验室,太原 030024;太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心,太原 030024
- 折叠
摘要
研究了不同预轧制变形时效对固溶态2055铝锂合金组织和力学性能的影响.结果表明,对固溶2055铝锂合金在时效前进行预轧制变形可显著缩短峰值时效时间、提高合金硬度和强度.当预轧制变形量为0、3%和10%时,2055铝锂合金分别在155℃下时效40、30和28 h达到峰值硬度(HV),分别为207.66、215.31和220.07.10%预轧制+155℃×28 h峰时效合金的屈服强度、抗拉强度分别达到562.64 MPa和622.04 MPa,比未预轧制、3%预轧制峰时效合金分别提高了67%、21%和43%、8%,大塑性变形诱导高密度位错促进析出相大量均匀弥散析出是其力学性能提高的主要原因.
Abstract
Effects of different pre-rolling deformations and aging on microstructure and mechanical properties of 2055 Al-Li alloy in solid-solution state were investigated.The results indicate that the pre-rolling deformation before aging can significantly shorten the peak aging time and improve the hardness and strength of the alloy.When the pre-rolling deformation amount is 0,3%and 10%,the peak hardness of 2055 Al-Li alloy at 155℃reaches 207.66 HV,215.31 HV and 220.07 HV aging for 40 h,30 h and 28 h,respectively.The yield strength and tensile strength of the alloy after 10%pre-rolling + 155 ℃×28 h peak aging reach 562.64 MPa and 622.04 MPa,which are 67%,21%and 43%,8%higher than those of peak aging alloy without pre-rolling and 3%pre-rolling,respectively.The enhancement in mechanical properties is attributed to high-density dislocations induced by plastic deformation,promoting uniformly dis-persed precipitation of large amounts of phases.
关键词
2055铝锂合金/预轧制变形/时效/力学性能Key words
2055 Al-Li Alloy/Pre-rolling Deformation/Aging/Mechanical Properties引用本文复制引用
基金项目
国家自然科学基金资助项目(52175355)
出版年
2024
NETL
NSTL
万方数据