摘要
采用XRD、OM和SEM等手段研究AM60合金中加入Sm和Ti后的组织和性能,并分别分析Sm和Ti对合金组织和性能的影响。结果表明,适量加入Sm和Ti都可以使合金组织得到极大地细化,减少了β相的析出,加入Ti后合金有少量的Al3Ti生成;Sm、Ti的复合加入则形成颗粒状Al2Sm、Mg41Sm5相和晕圈状球形化合物Al18Ti2Mg3,Ti的变质作用和适当的T6处理使合金中的杆状相钝化或者消失,粗大颗粒相变得圆整细小。复合添加比单独添加得到更优的力学性能,同时加入1.0%Sm和0.4%Ti,合金室温抗拉强度和伸长率分别达到226MPa和6.7%,比母合金分别提高了34.5%和39.6%;200℃高温抗拉强度和伸长率分别达到170MPa和10.4%,比母合金分别提高53.2%和82.5%。T6处理可以进一步提高该合金的力学性能。
Microstructures and mechanical properties of AM60 magnesium alloy with Sm and Ti addition were investigated through OM, SEM, XRD and DNS100 electronic universal testing machines and the effect of Sm and Ti addition was analyzed. The results show that the alloy grains can be refined greatly by the proper addition of Sm or Ti and reduce the precipitation of ft. There are some AI3Ti phases formed after the addition of Ti. However, the fl-Mgl7A112 phase of the AM60 alloy changes from discontinuous netlike form to cobble or particulate form and even dispersed after 1%Sm addition. Particle phase of A12Sm, Mg41Sm5 and spherical phase of AllsTi2Mg3 are formed when adding Sm and Ti together. The rod-shaped phases in the alloy dismiss or transform roundly and massive particles become smaller by the inoculation of Ti and subsequent T6 process. With addition of 1.0%Sm and 0.4%Ti, the tensile strength and elongation reach 226 MPa and 6.7%, elevated by 34.5% and 39.6% respectively; the heat tensile strength and elongation at 200 ℃ reach 170 MPa and 10.4%, elevated by 53.2% and 82.5% respectively. T6 process can further enhance the mechanical properties of AM60 alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第9期1574-1579,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50571073)
山西省自然科学基金(2009011028-3
20051052)
科技部资助基金(2009GJA30022)
关键词
镁合金
SM
TI
显微组织
力学性能
复合变质
magnesium alloy
Sin
Ti
microstructure
mechanical properties
compound inoculation
