烧结温度和保温时间对黏结剂喷射增材制造AlCoCrFeNi2.1共晶高熵合金显微组织和性能的影响
Eeffect of sintering temperature and holding time on microstructures and properties of AlCoCrFeNi2.1 eutectic high entropy alloy by binder jetting additive manufacturing
王启航 1李静静 1胡时东 1袁嘉明 1蔡道生 2魏青松1
作者信息
- 1. 华中科技大学 材料成形与模具技术国家重点试验室,武汉 430074
- 2. 武汉易制科技有限公司,武汉 430074
- 折叠
摘要
AlCoCrFeNi2.1共晶高熵合金具有断裂强度高、抗疲劳强度高等优点.本研究使用黏结剂喷射增材制造技术(Binder jetting additive manufacturing,BJAM)制备该合金,通过调节烧结温度(1290℃～1350℃)和保温时间(1～5 h)探究烧结工艺对该合金的显微组织及拉伸性能的影响.结果表明:烧结温度和保温时间通过影响孔隙率及晶粒大小直接影响高熵合金烧结件的性能;孔隙率的下降与晶粒长大同时发生,两因素耦合影响烧结件的力学性能.1350℃保温3 h样品的伸长率达7.09%、致密度达92.5%,1350℃保温1 h样品的屈服强度和断裂强度分别达到600.19 MPa和1021.32 MPa.
Abstract
The AlCoCrFeNi2.1 eutectic high entropy alloy(EHEA)is known for its high fracture strength and excellent fatigue resistance.In this research,we employed binder jetting additive manufacturing(BJAM)to fabricate the alloy.The influence of sintering temperature(1290℃to 1350℃)and holding time(1 to 5 h)on the microstructural evolution and tensile properties of the EHEA was systematically investigated.The results demonstrate that the sintering temperature and holding time directly influence the performance of the sintered high entropy alloy by affecting porosity and grain size.A decrease in porosity was observed concurrent with an increase in grain size,with their interplay exerting a pronounced effect on the mechanical properties of the sintered components.Remarkably,the sample sintered at 1350℃for 3 h achieves elongation rate of 7.09%and relative density of 92.5%.Furthermore,the sample sintered at 1350℃for 1 h exhibits a yield strength of 600.19 MPa and tensile strength of 1021.32 MPa.
关键词
黏结剂喷射/共晶高熵合金/烧结工艺/显微组织/拉伸性能Key words
binder jetting/eutectic high entropy alloy/sintering processes/microstructure/tensile properties引用本文复制引用
基金项目
国家自然科学基金(52275333)
中国航空制造技术研究院稳定支持项目(KZ571801)
湖北省重点研发资助项目(2020BAB049)
武汉市科技计划(2020010602012037)
容桂街道扶持战略性新兴产业研发项目(2020)()
出版年
2024
NETL
NSTL
万方数据