通过热模拟指导轧制 Al0.3CrFeNiCu1.5 合金和轧制合金板的断裂韧性

IF 3.7 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Today Communications Pub Date : 2024-09-03 DOI:10.1016/j.mtcomm.2024.110323
Rongyi Na, Shulin Dong, Yingdong Qu, Ruirun Chen, Guanglong Li, Wei Zhang, Siruo Zhang, Shibing Liu
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引用次数: 0

摘要

为了强化具有良好热变形加工性能和断裂韧性的高熵合金,避免微结构缺陷造成的性能损伤,设计并制备了优化的 AlCrFeNiCu 合金。研究了该合金的热变形曲线,推导了热压成分方程,绘制了热加工图,并研究了最佳热变形条件下的微观组织演变和断裂韧性。结果表明,该合金的扩散活化能(=70.39 KJ/mol)不高,应力指数(=13.11)高,功率耗散因子高,热加工区域大。这些都表明该合金具有良好的变形加工能力,变形加工可以提高合金的机械性能。热加工区确定为 940 C-1060 C,0.01 s-0.04 s。经过轧制和均匀化退火后,合金由 BCC+FCC 双相固溶体组成。轧制变形后,产生不连续的 DRX,形成软的 BCC 相(无序的 A2 相),无序的 A2 相相互挤压,提高了承载能力。位错强化效果明显。枝晶的优先生长方向是沿或沿 。断裂韧性值很高,达到 54.20 MPa-m。枝晶与切口相切,防止裂纹扩展形成障碍,有助于提高合金的断裂韧性。
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Rolling Al0.3CrFeNiCu1.5 alloy guided by hot simulation and fracture toughness of rolling alloy sheet
In order to strengthen high-entropy alloys with both good hot deformation processing property and fracture toughness, and avoid property damage caused by microstructure defects, optimized AlCrFeNiCu alloy is designed and prepared. The hot deformation curve of the alloy is studied, the constitutive equation of hot compression is deduced, the hot processing map is drawn, and the microstructure evolution and fracture toughness under the optimum hot deformation conditions are studied. The results show that the alloy has not high diffusion activation energy (=70.39 KJ/mol), high stress index (=13.11), high power dissipation factor and large hot processing zone. All show that the alloy has good deformation processing ability, and deformation processing can enhance the mechanical properties of the alloy. The hot processing zone is identified to be 940 C-1060 C, 0.01 s-0.04 s. After rolling and homogenization annealing, the alloy is composed of BCC+FCC dual-phase solid solution. After rolling deformation, discontinuous DRX is caused, forming a soft BCC phase (disordered A2 phase), and the disordered A2 phase squeezes each other to improve the bearing capacity. Dislocation strengthening effect is obvious. The preferred growth direction of the dendrite is either along <100> or along <110>. The fracture toughness value is high, reaching 54.20 MPa⋅m. The dendrite is tangent to the notch, which prevents the crack propagation from forming a barrier and helps to enhance the fracture toughness of the alloy.
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来源期刊
Materials Today Communications
Materials Today Communications Materials Science-General Materials Science
CiteScore
5.20
自引率
5.30%
发文量
1783
审稿时长
51 days
期刊介绍: Materials Today Communications is a primary research journal covering all areas of materials science. The journal offers the materials community an innovative, efficient and flexible route for the publication of original research which has not found the right home on first submission.
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