稀土La和Ce及超声处理对ZL201铝合金显微组织及抗拉强度的影响

Effect of Rare Earth Elements La and Ce and Ultrasonic Treatment on Microstructure and Tensile Strength of ZL201 Aluminum Alloy

本工作研究了稀土元素La和Ce的添加量及超声处理对铸态ZL201铝合金显微组织形貌、晶粒大小和抗拉强度的影响。结果表明:添加适量的稀土元素可有效抑制晶粒长大,进而细化枝晶和晶粒尺寸。添加稀土元素的ZL201-0.2%(质量分数,下同)La合金抗拉强度为207MPa,ZL201-0.6%Ce合金抗拉强度达到223MPa,分别比未添加稀土元素的ZL201合金提高了10.7%和19.3%。经超声处理后,ZL201-0.1%La合金抗拉强度达到247 MPa,比未经超声处理的ZL201-0.1%La合金提高了50.6%;ZL201-0.3%Ce合金抗拉强度达到226 MPa,比未经超声处理的提高了10.2%。

The effects of the addition of rare earth（RE）elements La and Ce and the ultrasonic treatment on the microstructure,grain size and tensile strength of as cast ZL201 aluminum alloy were investigated.The results show that a proper amount of RE elements are effective to restrain grain growth and refine dendrite and grain size.The tensile strength of ZL201-0.2%La（wt%）alloy is 207 MPa and the tensile strength of ZL201-0.6%Ce alloy reaches 223 MPa,which is 10.7%and 19.3% higher than that of ZL201 base alloy,respectively.After ultrasonic treatment,the tensile strength of ZL201-0.1%La alloy is as high as 247 MPa,50.6% higher than that of ZL201-0.1%La alloy without ultrasonic treatment;while the tensile strength of ZL201-0.3%Ce alloy is 226 MPa,10.2% higher than that without ultrasonic treatment.