摘要
利用铜模铸造法获得了直径为2 mm的Ti35Zr30Be27.5Cu7.5块体非晶合金。采用X射线衍射(XRD)、扫描电镜(SEM)、差氏扫描量热仪(DSC)及压缩试验等方法研究了非晶合金的相结构、显微组织和热稳定性,以及热处理对其压缩强度及塑性的影响。结果表明:在553和583 K温度下分别保温5 h后,实验合金仍保持为非晶态;在613 K保温1 h后,有晶化相出现。Ti35Zr30Be27.5 Cu7.5非晶合金在583 K下保温1 h后其塑性变形量达到了6.57%,较热处理前提高了1倍,且保持了热处理前的强度,屈服强度和抗压强度分别为1921 MPa,2169 MPa。随着热处理温度的提高,非晶相含量减少,合金断裂强度、塑性变形量随之降低;同时合金断裂方式由韧性断裂转变为脆性断裂。
Bulk amorphous alloy of Ti35Zr30Be27.5Cu7.5 with a diameter of 2 mm was obtained by copper mould casting.The phase structure,microstructure,thermal stability,especially the effects of heat treatment on compression strength and plasticity of this bulk amorphous alloy were investigated by means of X-ray diffraction（XRD）,scanning electron microscopy（SEM）,differential scanning calorimetry（DSC） and compression tests.The results show that the bulk alloy is still retained by amorphous phase at 553 K and 583 K for 5 h,respectively.After annealing at 613 K for 1 h,the crystal phase is observed.High yield strength of 1921 MPa,high compression strength of 2169 MPa and excellent plastic strain of 6.57% are obtained in the Ti35Zr30Be27.5Cu7.5 bulk amorphous alloy annealed at 583 K for 1 h.The plasticity is enhanced by one time compared to as-cast sample for Ti35Zr30Be27.5Cu7.5 bulk amorphous alloy.The compressive strength and plastic strain decrease for the alloy annealed at higher temperature of 613 K,accompanying with the progress of crystallization.The alloy rods both in as-cast and annealed（at 553 K and 583 K for 5 h） state show the fracture surfaces consisting of vein pattern.On the other hand,the fracture morphology of the alloy annealed at 613 K for 1 h,3 h and 5 h changes to brittle character with flat facets.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2011年第5期32-36,共5页
Transactions of Materials and Heat Treatment
基金
沈阳市科技局计划项目(071305)
吉林化工学院项目
