Effects of nano-sized TiB_(2) particles and Al_(3)Zr dispersoids on microstructure and mechanical properties of Al-Zn-Mg-Cu based materials  

纳米TiB_(2) 颗粒和Al_(3)Zr粒子对Al-Zn-Mg-Cu基材料显微组织和力学性能的影响

作　　者：Hong-yu XIAO Yu-gang LI Ji-wei GENG Hong-ping LI Ming-liang WANG Dong CHEN Zhu-guo LI Hao-wei WANG 肖宏宇;李宇罡;耿继伟;李红萍;汪明亮;陈东;李铸国;王浩伟(上海交通大学金属基复合材料国家重点实验室,上海200240;上海交通大学材料科学与工程学院,上海200240;安徽省铝基复合材料工程研究中心,淮北235000;上海飞机设计研究院,上海201203;上海交通大学上海市激光制造与材料改性重点实验室,上海200240)

机构地区：[1]State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China [2]School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [3]Anhui Provincial Engineering Research Center of Aluminium Matrix Composites,Huaibei 235000,China [4]Shanghai Aircraft Design and Research Institute,Shanghai 201203,China [5]Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第8期2189-2207,共19页中国有色金属学报（英文版）

基　　金：financial supports from the China Postdoctoral Science Foundation(Nos.2019TQ0193,2019M661497);the National Key Research and Development Program of China(No.2018YFB1106302);the National Natural Science Foundation of China(No.51821001);the Anhui Provincial Engineering Research Center of Aluminum Matrix Composites,China(No.2017WAMC002)。

摘　　要：The effects of TiB_(2) and Zr on the microstructure,aging response and mechanical properties of hot-extruded Al-Zn-Mg-Cu based materials were investigated and compared by multi-scale microstructure characterization techniques.The results showed that proper addition of TiB_(2) particles could refine grain size during solidification,promote dynamic recrystallization during extrusion,and inhibit grain growth during solution treatment.Meanwhile,Zr addition had minor influence on the grain refinement during solidification,but could effectively suppress recrystallization and grain growth compared with the Zr-free alloy.Furthermore,the TiB_(2) addition could simultaneously enhance the aging kinetics and peak-aged hardness of the materials.Comparatively,Zr addition could also improve the peak-aged hardness with minor effect on the aging kinetics of the materials.Finally,the quench sensitivity,elastic modulus and tensile properties of the materials were compared and studied.Specifically,the relationship between the microstructure and mechanical properties,and the strengthening mechanisms were discussed in detail.采用多尺度显微组织表征技术研究TiB_(2) 和Al_(3)Zr对热挤压Al-Zn-Mg-Cu基材料的显微组织、时效响应和力学性能的影响。结果表明,添加适量TiB_(2) 颗粒在凝固过程中能有效细化晶粒,挤压过程中能促进动态再结晶,固溶过程中能有效抑制晶粒长大。同时,与无Zr合金相比,Zr元素的添加在凝固过程在对晶粒细化无明显影响,但可以有效抑制再结晶和晶粒长大。TiB_(2) 颗粒能加快材料的时效动力学并且提高峰时效硬度;Zr元素也能提高材料的峰时效硬度,但对时效动力学无明显影响。最后,分析不同材料的淬火敏感性、弹性模量和拉伸性能,并研究此类材料显微组织与力学性能之间的关系及其强化机理。

关 键 词：TiB_(2) Al_(3)Zr microstructure aging kinetics mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]