冷轧及热处理对Al0.3CoCrFeNi高熵合金组织及性能的影响

doi:10.13251/j.issn.0254-6051.2020.03.020

摘要/Abstract

摘要：

利用X射线衍射仪、扫描电镜、透射电镜和拉伸试验等手段,研究了75%压下量的冷轧及1073 K下保温1 h热处理后不同冷却方式(空冷和炉冷)对Al_0.3CoCrFeNi高熵合金微观组织和力学性能的影响。结果表明:铸态以及冷轧态Al_0.3CoCrFeNi合金均为FCC单相结构,经热处理后炉冷及空冷合金均为FCC+BCC双相结构。铸态合金经冷轧以后强度显著提升但塑性大幅度下降。因细晶强化、孪晶以及析出相强化作用,热处理后炉冷合金具有良好的综合力学性能,其抗拉强度为1289 MPa,约为铸态试样的两倍(719 MPa),最大伸长率为28.7%。因析出相增多以及孪晶尺寸增大,与空冷合金相比,炉冷合金在不损失塑性的前提下,抗拉强度增加。

关键词: 高熵合金, 冷轧, 热处理, 组织, 力学性能

Abstract:

Effects of cold rolling with 75% reduction and different cooling methods (air cooling and furnace cooling) after heat treatment at 1073 K for 1 h on the microstructure and mechanical properties of Al_0.3CoCrFeNi high entropy alloy were studied by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy and tensile test. The results show that, all the as-cast and cold-rolled Al_0.3CoCrFrNi alloy samples are FCC single-phase structure. After holding at 1073 K for 1 h, both the furnace-cooled and the air-cooled samples are FCC+BCC dual-phase structure. Compared with the as-cast state, the strength of the alloy after cold-rolling increases significantly, but the plasticity decreases greatly. After the heat treatment, the furnace cooling sample has excellent mechanical properties due to fine grain strengthening, twinning and precipitation strengthening. The tensile strength of the furnace cooling sample is 1289 MPa, which is about twice as much as that of as-cast specimen(719 MPa), and the maximum elongation is 28.7%. Because of the increase of the precipitated phase and twin size, the strength of the furnace-cooled sample increases without loss of plasticity compared with that of the air-cooled sample.

Key words: high entropy alloy, cold rolling, heat treatment, microstructure, mechanical properties

中图分类号:

TG113.12

斯松华, 周方颖, 王建国. 冷轧及热处理对Al_0.3CoCrFeNi高熵合金组织及性能的影响[J]. 金属热处理, 2020, 45(3): 103-107.

Si Songhua, Zhou Fangying, Wang Jianguo. Effects of cold rolling and heat treatment on microstructure and properties of Al_0.3CoCrFeNi high entropy alloy[J]. HTM, 2020, 45(3): 103-107.

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