摘要
采用光学显微镜、SEM扫描电镜、XRD以及力学性能和电化学测试等手段,研究了不同Y含量对Mg-9Li-3Al合金组织、力学性能和腐蚀性能的影响。结果表明:随着Y的添加,α相的形貌逐渐发生变化,其体积分数也逐渐减少,并形成新的Al2Y相,Al2Y主要分布在β相和α相内部。当Y的添加量为1.6%(质量分数)时,材料的抗拉强度达到最大190.2 MPa;当Y含量为2.0%时,材料的最大延伸率为19.3%。在Y含量低于1.2%时,材料的抗腐蚀性能随Y含量的增加而减小,超过1.2%后,随着Y含量的增加而增加。
The influence of Y on the microstructure,the mechanical property and the corrosion resistance of Mg-9Li-3Al alloy was investigated by optical microscopy,scanning electronic microscopy （SEM）,X-ray diffraction （XRD）,mechanical properties testing and electrochemical measurement.The results show that the addition of Y can change the microstructure form of the α phase and reduce its volume fraction.Meanwhile,the binary Al2Y phase is mainly distributed inside the β phase and the α phase is formed.The addition of Y can effectively improve the ultimate tensile strength （UTS） and the elongation （EL） of the alloy.Upon 1.6 wt％ Y addition,the UTS of the alloy is up to 190 MPa; the maximal EL reaches 19.3％ when the content of Y is 2wt％.The corrosion resistances of the alloy are found to decrease upon Y content less than 1.2wt％ and then increase upon Y content from 1.2wt％ to 2.0wt％.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期1993-1998,共6页
Rare Metal Materials and Engineering
基金
National Basic Research Program of China(2007CB613702)
International Scientific and Technological Cooperation Projects(2010DFR50010)
关键词
镁合金
组织
力学性能
抗腐蚀性能
magnesium alloy
microstructure
mechanical property
corrosion resistance
