(鄭州大學(xué) 材料科學(xué)與工程學(xué)院， 鄭州 450002)
摘 要: 采用DSC，EDS，SEM及TEM等分析手段，研究了微量Ti和Ce對(duì)新型AlMgSi基鋁合金汽車(chē) 車(chē)身板材成形性能的影響。結(jié)果表明：對(duì)含0.25%～0.27%Ti(質(zhì)量分?jǐn)?shù))的鋁合金中，Ti 除了作為異質(zhì)核心起細(xì)化晶粒作用外，還分布于晶界，通過(guò)抑制α(Al)晶粒生長(zhǎng)有效地細(xì)化組織，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，從而促使形成β′相，降低板材的抗拉強(qiáng)度，使屈強(qiáng)比增大，從而不利于成形性能。同時(shí)還研究了過(guò)剩Si和Mg2Si對(duì)板材性能的影響。
關(guān)鍵字: 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
