CAJ | 학술논문

采用Gleeble-3500热模拟机对时效态Mg-10Gd-3Y-0.5zr (GW103)和Mg-12Gd-3Y-0.5Zr(GW123)稀土镁合金在变形温度为25～350℃、应变速率为0.01 s~(-1)、最大变形程度为1的条件下进行压缩模拟试验,利用金相显微镜和扫描电镜观察组织变化.结果表明:GW103和GW123合金的室温抗压强度分别为419MPa和460MPa;150-200℃时GW123合金的抗压强度大干GW103合金;当温度高于250℃时,两种合金的抗压强度相近.分析表明250℃以下压缩时,孪生变形是影响压缩力学性能的主要因素;300～350℃压缩时,晶界和变形带处发生动态再结晶是影响压缩力学性能的主要因素.
채용Gleeble-3500열모의궤대시효태Mg-10Gd-3Y-0.5zr (GW103)화Mg-12Gd-3Y-0.5Zr(GW123)희토미합금재변형온도위25～350℃、응변속솔위0.01 s~(-1)、최대변형정도위1적조건하진행압축모의시험,이용금상현미경화소묘전경관찰조직변화.결과표명:GW103화GW123합금적실온항압강도분별위419MPa화460MPa;150-200℃시GW123합금적항압강도대간GW103합금;당온도고우250℃시,량충합금적항압강도상근.분석표명250℃이하압축시,련생변형시영향압축역학성능적주요인소;300～350℃압축시,정계화변형대처발생동태재결정시영향압축역학성능적주요인소.
The compressive true stress-true strain behaviors of Mg-10Gd-3Y-0.5Zr (GW103) and Mg-12Gd-3Y-0.5Zr (GW123) Mg-RE alloys in T6 treatment were investigated on a hot-stimulation machine Gleeble 3500. The tests were carried out at a strain rate of 0.01 s~(-1) and the deformation temperatures 25-350℃ and the maximum strain of 1. The evolution of microstructure was observed with optical microscope and scanning electronic microscope. The results show that the room temperature compression strengths of GW103 and GW123 alloys are 419 MPa and 460 MPa, separately; the compression strength of GW123 alloy is bigger than that of GWl03 alloy between 150-200℃, and at above 250 ℃ the compression strengths of the two alloys are similar. Analysis shows that twinning deformation is the main factor impacts the compressive mechanical properties of both alloys below 250℃. The dynamic recrystallization which exists in the grain boundary and deformation band is the main factor that effects the compressive mechanical properties between 300-350℃.