新型细化剂Al-5Ti-1B-7Sm对7050合金显微组织及力学性能影响  

Effect of the new refiner Al-5Ti-1B-7Sm on the properties of 7050 alloy

作　　者：万里 翟凤龙 WAN Li;ZHAI Feng-long(Heilongjiang University of Science and Technolgy,Harbin 150022,China)

机构地区：[1]黑龙江科技大学,黑龙江哈尔滨150022

出　　处：《世界有色金属》2024年第7期7-9,共3页World Nonferrous Metals

摘　　要：研究了细化剂Al-5Ti-1B-7Sm对7050合金显微组织及力学性能的影响。实验表明,Al-5Ti-B-7Sm细化剂主要由Ti2Al20Sm和TiB2相构成,同时含有极少量的TiAl3;在7050合金中,细化剂的最优添加量为0.6%,平均晶粒尺寸由未细化前的120.9μm减小至66.9μm,铸态合金的极限抗拉强度由120MPa提高到141MPa。细晶强化是Al-5Ti-1B-7Sm细化剂提高7050合金强度的主要原因。This study investigates the effect of Al-5Ti-1B-7Sm refiner on the microstructure and mechanical properties of 7050 alloy.Experiments show that Al-5Ti-B-7Sm refiner is mainly composed of Ti2Al20Sm and TiB2 phases,and contains a very small amount of TiAl3.In 7050 alloy,the optimal amount of refiner added was 0.6%,the average grain size was reduced from 120.9μm before refinement to 66.9μm,and the ultimate tensile strength of cast alloy was increased from 120MPa to 141MPa.Fine-grain strengthening is the main reason why Al-5Ti-1B-7Sm refiner improves the strength of 7050 alloy.

关 键 词：7050合金 细化剂 显微组织 力学性能 

分 类 号：TG156.94[金属学及工艺—热处理]