退火对冷轧Al0.2CoCrFe2Ni高熵合金组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.11.024

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 132-137.DOI: 10.13251/j.issn.0254-6051.2020.11.024

退火对冷轧Al_0.2CoCrFe₂Ni高熵合金组织和力学性能的影响

王文文, 田权伟, 王轶农

大连理工大学材料科学与工程学院, 辽宁大连 116024

收稿日期:2020-04-20 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 王轶农,教授,博士,E-mail: wynmm@dlut.edu.cn
作者简介:王文文(1993—),女,硕士,主要研究方向为高熵合金,E-mail: 2942356448@qq.com。
基金资助:
国家自然科学基金(51471041)

Effect of annealing on microstructure and mechanical properties of cold rolled Al_0.2CoCrFe₂Ni high entropy alloy

Wang Wenwen, Tian Quanwei, Wang Yinong

School of Materials Science and Engineering, Dalian University of Technology, Dalian Liaoning 116024, China

Received:2020-04-20 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 研究了不同温度退火对80%冷轧Al_0.2CoCrFe₂Ni高熵合金显微组织和力学性能的影响。使用X射线衍射仪(XRD) 、电子背散射衍射仪(EBSD)、微控电子万能试验机分别对合金进行了晶体结构、织构类型和力学性能的表征。结果表明,合金在铸态、轧制态以及退火态都表现为稳定FCC晶体结构。合金铸态下呈现典型的树枝晶组织,经80% 轧制后出现了明显的轧制变形带,在随后的退火过程中发生再结晶,其再结晶晶粒体积分数及其晶粒尺寸随着退火温度的升高而增加。合金经过80%轧制后主要表现为(111)<112>织构,其织构强度随着退火温度的升高而降低。80%轧制使Al_0.2CoCrFe₂Ni合金获得较大的抗拉强度(1005 MPa)和较低的塑性(10%), 随着退火温度的提高,合金的强度降低塑性增强,并在700 ℃退火时合金获得最佳的综合力学性能,该过程主要取决于合金中的位错密度、再结晶体积分数和晶粒尺寸及其再结晶织构的演变。

关键词: 高熵合金, 退火, 显微组织, 力学性能, 织构

Abstract: Effect of annealing temperature on the microstructure and mechanical properties of Al_0.2CoCrFe₂Ni high entropy alloy with 80% cold rolling was studied. The crystal structure, texture type, and mechanical properties of the alloy were characterized by means of X-ray diffractometer (XRD), electron backscatter diffractometer (EBSD), and microelectronic testing machine, respectively. The results show that the alloy exhibits a stable FCC crystal structure at the as-cast, as-rolled and as-annealed states. The alloy has a typical dendritic structure at the as-cast state. After 80% rolling, significant rolling deformation bands appear, and recrystallization occurs in the subsequent annealing process. The volume fraction and grain size of recrystallized grains increase with the increase of annealing temperature. The alloy mainly exhibits (111) <112> texture after 80% rolling, and its texture intensity decreases with the increase of annealing temperature. The Al_0.2CoCrFe₂Ni high entropy alloy obtains greater tensile strength (1005 MPa) and lower plasticity (10%) after 80% rolling. As the annealing temperature increases, the strength of the alloy decreases and the plasticity increases, and the best comprehensive mechanical properties are obtained when annealed at 700 ℃, which mainly depends on the changes of dislocation density, recrystallization volume fraction and grain size, and the evolution of the recrystallization texture in the alloy.

Key words: high entropy alloy, annealing, microstructure, mechanical properties, texture

中图分类号:

TG113.25

王文文, 田权伟, 王轶农. 退火对冷轧Al_0.2CoCrFe₂Ni高熵合金组织和力学性能的影响[J]. 金属热处理, 2020, 45(11): 132-137.

Wang Wenwen, Tian Quanwei, Wang Yinong. Effect of annealing on microstructure and mechanical properties of cold rolled Al_0.2CoCrFe₂Ni high entropy alloy[J]. Heat Treatment of Metals, 2020, 45(11): 132-137.

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退火对冷轧Al_0.2CoCrFe₂Ni高熵合金组织和力学性能的影响

Effect of annealing on microstructure and mechanical properties of cold rolled Al_0.2CoCrFe₂Ni high entropy alloy

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