摘要
采用真空熔炼制备不同成分(Zr_(50)Ti_(50))_(100-x)Si_x(x=0,0.5,1.0,1.5,2.0 at.%)铸态合金。选用光学显微(OM),X射线衍射仪(XRD),扫描电镜(SEM)对铸态合金的显微结构进行表征。结果表明:Si元素的加入,合金的晶粒尺寸减小,当Si含量为1.5%和2.0%时,合金晶粒明显细化,且均匀;当Si含量大于1.0%时,合金中出现Zr2Si相衍射峰,随着Si量增多,Zr2Si峰强度明显增加。对合金进行压缩性能检测表明:(Zr_(5)0Ti_(50))_(98.5)Si_(1.5)与(Zr_(50)Ti_(50))_(98)Si_2合金抗压强度均大于1400 MPa,且具有较高的塑性,展示了良好的综合力学性能,而(Zr_(50)Ti_(50))_(99)Si_1合金的强度与塑性最差,这是由于Si含量为1.0%时,合金的晶粒较大、且形状不规则所致。此外,合金的硬度与屈服强度的变化是相一致的,Si含量为1.5%时,虽其硬度值略低于未加Si的合金,但也达到较高的值,约400 HV0.2。
（ Zr50Ti50）100-xSix（ x = 0,0. 5,1. 0,1. 5,2. 0,at. %） as-cast alloys were prepared under vacuum atmosphere in an melting furnace. Optical microscopy（ OM）,X-ray diffractometry（ XRD） and scanning electron microscope（ SEM） were used to characterize the microstructure of the alloys. The results show that the grain size of the alloys reduces with addition of Si element. When the content of Si is 1. 5% and 2. 0%,the grains of the alloys are obviously refined and uniform. The diffraction peaks of the Zr2 Si phase appear as Si content exceeding 1. 0%,the peaks become stronger with the increase of Si content. The results of the compressive properties tests of alloys show that the compressive strength of（ Zr50Ti50）98. 5Si1. 5and（ Zr50Ti50）98Si2alloys is more that 1400 MPa,and both the alloys have a high plasticity,which exhibits excellent mechanical properties. However,the strength and plasticity of the（Zr50Ti50）99 Si1alloy are the lowest.The reason is that the grains of the（ Zr50Ti50）99Si1 alloy are large and with rregular shape. In addition,the change trend of hardness and yield strength is consistent. When the content of Si is 1. 5%,the hardness reaches a higher value of 400 HV0. 2,although the value is slightly lower compared with that of without adding Si.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第8期85-88,共4页
Heat Treatment of Metals
基金
陕西省教育厅科研计划项目(14JK1155)
陕西理工大学博士科研启动项目(SLGQD13(2)-14)
