【作者】 王华； 尹志民； 郭加林； 邓英； 彭小芒； 何振波；

【Author】 Wang Hua~①Yin Zhimin~①Guo Jialin~①Deng Ying~①Peng Xiaomang~①He Zhenbo~(①②) (①School of Materials Science and Engineering,Central South University,Changsha,China;②Northeast Light Alloy Co.Lid,Harbin,China)

【机构】 中南大学 材料科学与工程学院； 东北轻合金有限责任公司；

【摘要】 采用拉伸和疲劳力学性能测试、金相和透射电子显微分析,比较研究了2524和用微量Sc、Zr合金化的2524合金（2524SZ）合金薄板的组织和性能,重点考察了Sc、Zr的微合金化对2524合金疲劳特性的影响。结果表明:当应力比R=0.1时,2524合金的疲劳强度为184MPa,2524SZ合金的疲劳强度为194MPa,比2524合金提高了5%。微量Sc和Zr在2524 SZ合金中主要以次生的Al₃（Sc,Zr）粒子形式存在,这种粒子与基体共格,钉扎位错和亚晶界,高温固溶处理过程中仍然能够部分抑制合金的再结晶。晶粒细化、亚结构强化和Al₃（Sc,Zr）相析出强化是微量Sc和Zr使2524 SZ合金疲劳强度提高的主要原因。更多还原

【Abstract】 The microstructure and properties of 2524 and 2524 alloy sheet with minor scandium and zirconium was comparatively studied though tensile and fatigue properties measurement,OM,SEM and TEM.We studied the effect of minor Sc and Zr on the fatigue properties of 2524 alloy.The result show that the fatigue limit of 2524 alloy is 184MPa, and the fatigue limit of 2524SZ alloy is 194MPa,which is increased by 5% on the condition of R=0.1.Minor Sc and Zr exist in the 2524 alloy in the form of secondary Al₃（Sc,Zr）particle,this particle is coherence with matrix,it can pin the dislocation and sub-boundary,and partly inhibit the recrystallization of the alloy during high-temperature solution.Fine grain strengthening,substructure strengthening and Al₃（Sc,Zr）precipitation strengthening is responsible for the increase of the yield strength and fatigue limit.更多还原