变形Mg-1.5Zn-xCe合金织构及室温成形性能  

Texture and room-temperature formability of rolled Mg-1.5Zn-xCe alloys

作　　者：江海涛[1] 马昭[1] 蔡正旭[1] 舒滢 康强[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]西部钛业有限责任公司,西安710201

出　　处：《工程科学学报》2015年第2期204-210,共7页Chinese Journal of Engineering

摘　　要：实验研究了不同Ce元素含量对变形Mg-1.5Zn合金的织构及室温成形性能的影响.结果表明:在相同的热轧和退火工艺处理后,添加不同含量的Ce元素均可以有效弱化镁合金织构强度.Mg-1.5Zn合金中添加质量分数为0.2%的Ce元素后表现出了优异的室温成形性能,织构强度最大值仅为2.20,织构沿着横向分裂,并且基面法向即c轴沿着横向发生约为±35°偏转,室温下轧向方向延伸率达到23.2%,埃里克森杯突值为5.46,平面各项异性系数Δr=0.01;然而,Mg-1.5Zn合金中添加质量分数分别为0.5%和0.9%的Ce元素后,织构强度增加,埃里克森杯突值减小,由于在合金中生成了粗大的第二相粒子,使得Mg-1.5Zn-x Ce合金的室温成形性能变低.The texture and room-temperature formability of rolled Mg-1.5Zn alloys containing different contents of Ce were inves- tigated by experiment, it is indicated that during the same hot rolling and annealing processes, Ce addition can effectively modify and weaken the texture. When 0. 2wt% Ce is added, the Mg-1.5Zn alloy has excellent room-temperature formability, and its maximum texture intensity is only 2. 20. This alloy exhibits the transverse direction split texture, whose basal pole is tilted by about ±35° from the normal direction toward the transverse direction. At room temperature, the Erichsen value reaches 5.46, and the ultimate elonga- tion in the rolling direction is 23.2% with a low planar anisotropy value of 0. 01. However, 0. 5% and 0. 9% Ce additions promote the formation of huge secondary phase particles, resulting in an increase in the intensity of the basal texture, a decrease in the Erichsen value, and deterioration in the room-temperature stretch formability.

关 键 词：镁合金 稀土元素添加 铈 织构 成形性 

分 类 号：TG146.22[一般工业技术—材料科学与工程]