摘要
研究了Sb的加入对AM50合金的铸态组织和力学性能的影响。结果表明,随着Sb加入量的增加,呈连续或断续网状的β相转变为条状或颗粒状,当Sb加入量为0.5%时,AM50合金的铸态组织得到明显细化,且在组织中出现了条状新相Mg3Sb2。随着Sb加入量继续增加,Mg3Sb2相明显增多且尺寸较大,基本上分布在晶界或枝晶处。随着Sb加入量的增加,AM50合金的拉伸强度呈现先升后降的趋势,在0.5%Sb时,拉伸强度达到最大值180.2MPa,比未添加Sb时提高了17.7%。伸长率随着Sb的加入基本上呈现下降的趋势。加入Sb后,AM50合金的断裂方式由塑性断裂到混合断裂再转变为解理断裂。
The effect of Sb on the as-cast microstructure and mechanical properties of magnesium alloy AM50 was investigated. The results show that with increasing the addition of Sb, 13 phase is changed from continuous or discontinuous netlike form to strip or particulate form. When the addition of Sb is 0.5%, the as-cast microstructure is refined obviously and strip new phase Mg3Sb2 appears. With the continuous increase of the addition of Sb, Mg3Sb2 phase increases more obviously and becomes bigger. With the increase of Sb, the tensile strength of AM50 alloy first increases and then decreases, whereas the elongation tends to decrease. The fracture mechanism of AM50 alloy is changed from ductile fracture to mixed fracture and then to cleavage fracture with the addition of Sb.
出处
《铸造技术》
CAS
北大核心
2009年第6期791-795,共5页
Foundry Technology
关键词
合金元素
镁合金
显微组织
力学性能
晶粒细化
Alloying element
Magnesium alloy
Microstructure
Mechanical properties
Grain refinement
