摘要
研究了Si、Ca和Ce混合添加对压铸镁合金AZ91D在应力比R=0.1,循环基数N=107条件下的高周疲劳性能的影响。显微组织观察表明,当Si、Ca和Ce、Ca分别混合加入到AZ91D合金中时,合金组织细化,合金中分别出现Mg2Si和Al11Ce3新相,而没有含Ca相化合物出现。力学性能测试表明,随着Si、Ca和Ce、Ca的添加,合金的力学性能得到明显改善,但伸长率变化不大。疲劳性能测试表明,当合金中加入1.0%的Ce和0.4%的Ca时,合金的疲劳强度最高,达到83.5MPa。含Si、Ca和Ce、Ca两种合金的疲劳断口都具有韧脆混合断裂特征。
Effects of Si, Ca and Ce mixed addition on high cycles fatigue properties of die cast magnesium alloy AZ91D were investigated at the stress ratio of 0.1 and the number of cycles to failure of 107. It is found that the grain size in microstructure of the alloys is refined with the Si, Ca mixed addition or Ce, Ca mixed addition, in which Mg2Si phase and Al11Ce3 phase appear and absence of phase containing Ca can be observed. The tensile strength of the alloy with Si, Ca mixed addition or Ce and Ca mixed addition is greatly improved, however, elongation exhibits slight change. The maximum fatigue strength of 83.5MPa in the alloy can be obtained with 1.0% Ce and 0.4% Ca mixed addition. The fracture morphology of the alloy with Si and Ca mixed addition or Ce and Ca mixed addition are characterized by dimple-brittle mixed fracture.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2009年第10期927-930,共4页
Special Casting & Nonferrous Alloys
基金
吉林省科技厅应用基础研究项目(20090544)
长春工业大学大学生创新实验项目
关键词
压铸
镁合金
SI
CA
CE
疲劳性能
Die Casting, Magnesium Alloy, Si, Ca, Ce, Fatigue Properties
