原位合成5TiB2/Al-4.5Cu复合材料的组织及性能  

Microstructure and Properties of In-situ Svnthesized 5TiB_(2),Al-4.5Cu Composites

作　　者：李聪 徐宏[1] 毛红奎[1] 蔚琦 宋峰 张浩[1] 王宇 陈利华[2] Li Cong;Xu Hong;Mao Hongkui;Wei Qi;Song Feng;Zhang Hao;Wang Yu;Chen Lihua(School of Materials Science and Engineering,North Central University;Beijing North Vehicle Group Co.,Ltd.)

机构地区：[1]中北大学材料科学与工程学院,太原030051 [2]北京北方车辆集团有限公司

出　　处：《特种铸造及有色合金》2023年第4期469-474,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51775521);山西省自然科学基金资助项目(202103021224179);山西省重点研发计划国际科技合作资助项目(201903D421080);山西省高等教育科技创新资助项目(2020L0319)。

摘　　要：采用机械搅拌辅助混合盐法制备了TiB2质量分数为5%的Al-4.5Cu复合材料,借助光学显微镜、XRD、SEM、DES和TEM等手段对复合材料微观组织进行观察和分析,并通过拉伸试验测试了其力学性能。结果发现,TiB2颗粒通过产生位错塞积、位错环以及增加位错密度等方式阻碍位错的运动来强化基体合金。添加5%的TiB2的Al-4.5Cu合金屈服强度和抗拉强度比Al-4.5Cu合金分别提高了68.94%和32.65%,伸长率降低了45.56%,但其综合力学性能仍提高了11.33%。Cu-Ni alloy was chosen as the reference specimen,and the effects of preparation process on the nickel release rate were investigated.The results indicate that when nickel content of Cu-Ni alloy is below 1%,nickel release rate in artificial sweat is approximately positively correlated with the nickel content.When the specimen is melted and hand made casting in atmosphere,the uniformity of nickel release rate is poorer than that of continuous casting slab,which can be improved by annealing treatment.When the specimen surface is worn by sand paper,the average nickel release rate is decreased with the increase of sandpaper specifications.Therefore,the nickel content can be controlled between 0.05%and o.1%in priority during the preparation of nickel release reference specimen.The slab is made by remelting continuous casting after vacuum granulation,and then rolled and blanked.The test piece can be annealed at high temperature,of which the surface should be grinded with 800#or finer sandpaper.

关 键 词：AL-4.5CU合金 TIB2 位错 力学性能 强化机理 

分 类 号：TB331[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—金属材料]