均匀化对TiN细化Al-Zn-Mg-Cu合金组织和硬度的影响  

Influence of Homogenization Treatment on Microstructure and Hardness of Nano TiN Refined Al-Zn-Mg-Cu Aluminum Alloy

作　　者：肖亚婷 蔡启舟[1] 李欣蔚[1] 孙嘉璐[1] 赵炳怡 李冰[1] Xiao Yating Cai Qizhou Li Xinwei Sun Jialu Zhao Bingyi Li Bing(State Key Laboratory ot＂ Materials Processing and Dies ＆ Mould Technology, Huazhong University of Science and Technolog)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室

出　　处：《特种铸造及有色合金》2016年第10期1112-1116,共5页Special Casting & Nonferrous Alloys

摘　　要：研究了均匀化处理对纳米TiN/Ti细化Al-Zn-Mg-Cu合金组织及性能的影响。结果表明,纳米TiN/Ti细化剂可显著细化铸态Al-Zn-Mg-Cu铝合金晶粒,使合金的铸态硬度(HV)从123提高至142.3。470℃×24h一级均匀化处理后,Al-Zn-Mg-Cu合金晶界第二相得到了比较充分的溶解,只有少量MgZn2相残留;经过(400℃×10h+470℃×24h)二级均匀化处理后,第二相溶解充分,但在均匀化处理之后的冷却过程中析出MgZn相,并均匀分布在晶粒中。The influences of homogenization treatment on microstructure and mechanical properties of AlZn-Mg-Cu alloy refined by nano TiN/Ti were investigated by SEM,EDS,XRD and hardness test.The results show that the nano TiN/Ti can refine the grains of Al-Zn-Mg-Cu alloy significantly.Hardness of as-cast Al-Zn-Mg-Cu alloy with TiN is improved from 123（HV）to 142.3（HV）.After one-step homogenization（470℃×24h）,the secondary phases in the Al-Zn-Mg-Cu alloy dissolved more sufficiently,almost only MgZn2 phases left.After two-step homogenization（400 ℃×10h ＋ 470 ℃×24h）,MgZn phases are precipitated in the cooling process after homogenizing treatment and distributed uniformly in the grain.

关 键 词：AL-ZN-MG-CU合金 纳米TiN/Ti复合细化剂 均匀化处理 

分 类 号：TG292[金属学及工艺—铸造]