纳米TiN/Ti细化剂对7050合金组织和性能的影响  

Effect of Nano TiN/Ti Refiner on As-cast Microstructure and Properties of 7050 Aluminium Alloy

作　　者：李欣蔚[1] 肖亚婷 李冰[1] 干路 罗强[1] 蔡启舟[1] 

机构地区：[1]华中科技大学材料成形及模具技术国家重点实验室

出　　处：《特种铸造及有色合金》2014年第4期341-345,共5页Special Casting & Nonferrous Alloys

摘　　要：采用高能球磨法制备了纳米TiN/Ti复合晶粒细化剂,研究了该细化剂对7050铝合金铸态组织和性能的影响。结果表明,0.2%的复合细化剂对7050铝合金细化效果明显优于纯Ti细化剂,可使合金平均晶粒尺寸由未添加细化剂的105.5μm细化至83.5μm,组织中的第二相细小、分布较均匀。添加了复合细化剂的7050铝合金铸态抗拉强度由未添加细化剂的187.8MPa提高至220.8MPa,硬度(HB)由未添加细化剂时的97.63提高至102.7。A kind of Ti cladding nano-sized TiN（TiN/Ti） energy ball milling. Effects of the grain refiner prepared the 7050 aluminum a pure Ti in refining gr num alloy is refined f distribution in the mi lloy were a ain of 7050 composite grain refiner was prep on the as-cast microstructure and ared by hi properties pproached. The results show that TiN/Ti grain refiner is superior viously, and rom 105.5 μm to 83.5 μm, meanwhile, se the average grain size in the 7050 alumi- cond phases is well refined with uniform crostructure. Tensile strength and hardness of 7050 aluminum alloy with TiN/Ti grain refiner are improved from 187.8 MPa to 220.8 MPa and from HB97.63 to HB102.7, respectively.

关 键 词：纳米TiN 7050铝合金 铸态组织 晶粒细化 抗拉强度 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG115[金属学及工艺—金属材料]