摘要
为了获得更高性能的铝基复合材料(AMCs),采用室温异步轧制(AR,298 K)和深冷异步轧制(ACR,77 K)制备高熵合金颗粒增强铝基复合材料带材。通过拉伸实验、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对铝基复合材料的力学性能和微观结构进行分析。结果表明,深冷异步轧制比室温异步轧制更能提高复合材料的力学性能。深冷异步轧制含3%(质量分数)高熵合金颗粒的铝基复合材料的抗拉强度达到253 MPa,比室温异步轧制复合材料提高13.5%。与室温异步轧制相比,深冷异步轧制的复合材料具有更少的微孔洞、更细小的晶粒尺寸和更高的位错密度。深冷异步轧制复合材料微缺陷的减少是因为铝基高熵合金颗粒复合材料在深冷环境中具有合适的体积收缩效应。
To achieve higher performance of aluminum matrix composites(AMCs),high-entropy alloy particles(HEAp)-reinforced AMCs sheets were processed via asymmetric rolling(AR,298 K)and asymmetric cryorolling(ACR,77 K)methods.The mechanical properties and microstructure of the HEAp/AMCs were analyzed by tensile tests,scanning electron microscopy(SEM),and transmission electron microscopy(TEM).The results suggest that ACR improved the mechanical properties of HEAp/AMCs to a higher degree than AR.The ultimate tensile strength(UTS)of ACR 3 wt.%HEAp/AMCs reached 253 MPa,which was 13.5%higher than that achieved with AR.ACR resulted in fewer microvoids,finer grain sizes,and higher dislocation density in HEAp/AMC sheets compared to AR.Such a reduction of defects during ACR can be attributed to the volume shrinkage effect of the HEAp/AMCs in the cryogenic environment.
作者
罗开广
吴雨泽
熊汉青
张昀
Charlie KONG
喻海良
Kai-guang LUO;Yu-ze WU;Han-qing XIONG;Yun ZHANG;Charlie KONG;Hai-liang YU(State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,Changsha 410083,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;Mark Wainwright Analytical Centre,University of New South Wales,Sydney,NSW 2052,Australia;Light Alloys Research Institute,Central South University,Changsha 410083,China)
基金
the National Key Research and Development Program of China(No.2019YFB2006500)
the High-tech Industry Technology Innovation Leading Plan of Hunan Province,China(No.2020GK2032)
the Innovation Driven Program of Central South University,China(No.2019CX006)
the Research Fund of the Key Laboratory of High Performance Complex Manufacturing at Central South University,China,for financial support。
