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采用水冷铜模吸铸法制备直径为4 mm的Fe_(41)Co_7Cr_(15)Mo_(14)Y_2C_(15)B_6块体非晶合金,利用X射线衍射(XRD)和差式扫描量热分析仪(DSC)分别对该非晶的结构及热力学参数进行表征。利用Gleeble 3500热模拟机在过冷液相区温度620℃下,以1×10~(-2)s~(-1)的应变速率对该非晶合金进行压缩变形,研究变形量(20%、40%和75%)对该非晶合金结构和热稳定性的影响。结果表明,该条件下非晶试样能发生较好的塑性变形并未发现明显的晶化,且随着塑性变形的增加,非晶合金的热稳定性更加优异,当形变量为75%时,非晶合金的玻璃转变温度和过冷液相区宽度分别从铸态的585℃和40℃增大至658℃和59℃。变形影响非晶试样的显微硬度,宏观表现为应变量越大其显微硬度越高,当塑性形变量为20%、40%及75%时,对应最高维氏硬度分别为1258,1270和1288 HV。
A Fe_ (41) Co_7Cr_ (15) Mo_ (14) Y_2C_ (15) B_6 bulk amorphous alloy with a diameter of 4 mm was prepared by water-cooled copper mold suction casting method. XRD and DSC The structures and thermodynamic parameters of the amorphous materials were characterized by DSC. The Gleeble 3500 thermal simulator was used to compress and deform the amorphous alloy at a strain rate of 1 × 10 -2 s -1 at a temperature of 620 ℃ in the supercooled liquid region to study the effect of deformation (20% , 40% and 75%) on the structure and thermal stability of the amorphous alloy. The results show that under these conditions, the amorphous samples can have good plastic deformation and no obvious crystallization has been found. With the increase of plastic deformation, the thermal stability of amorphous alloys is more excellent. When the deformation amount is 75% , The glass transition temperature and supercooled liquid region width of amorphous alloys increased from as-cast 585 ℃ and 40 ℃ to 658 ℃ and 59 ℃, respectively. Deformation affects the microhardness of the amorphous sample, macroscopically the higher the strain the higher the microhardness, the corresponding maximum Vickers hardness of plastic deformation of 20%, 40% and 75%, respectively 1258,1270 And 1288 HV.