(郑州大学 材料科学与工程学院， 郑州 450002)
摘 要: 采用DSC，EDS，SEM及TEM等分析手段，研究了微量Ti和Ce对新型AlMgSi基铝合金汽车 车身板材成形性能的影响。结果表明：对含0.25%～0.27%Ti(质量分数)的铝合金中，Ti 除了作为异质核心起细化晶粒作用外，还分布于晶界，通过抑制α(Al)晶粒生长有效地细化组织，提高成形性能；Ce的加入提高了β″相的激活能，降低了β′相的激活能，从而促使形成β′相，降低板材的抗拉强度，使屈强比增大，从而不利于成形性能。同时还研究了过剩Si和Mg2Si对板材性能的影响。
关键字: Ti；Ce；AlMgSi基合金板材；成形性能
of new type AlMgSi based alloy sheet
（School of Materials Science and Engineering，
Zhengzhou University，Zhengzhou 450002，China）
Abstract:The influence of Ti，Ce elements on forming properties of new type Al MgSi based alloy auto body sheet was studied systematically by using DSC，SEM，EDS and TEM. The results show that, 0.25%～0.27%Ti(mass fraction) is advantageous to refining microstructure as heterogeneous nucleus and to restricting the growth of α(Al) grains through the distribution on the grain boundaries，so that the forming properties of AlMgSi based alloy sheet are improved. The addition of Ce increa, ses the activation energy of β″ phase and decreases that of β′ phase, so the formation of β′ phase is promoted. Therefore the tensile strength of AlMgSi based alloy sheets is decreased and the ratio of yield strength and tensile strength is increased, which harms to the forming properties. Besides，the effect of contents of excessive Si and Mg2Si of AlMgSi based alloy sheets was studied.
Key words: Ti; Ce; AlMgSi based alloy sheets; forming property
