Yb2O3对Ti-1100铸态合金高温力学性能的影响  

Effect of Yb2O3 on Mechanical Properties of Ti-1100 As-cast Alloy Under High Temperature

作　　者：贾宝华 刘翔 顾永强 李革 JIA Baohua;LIU Xiang;GU Yongqiang;LI Ge(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014000,China)

机构地区：[1]内蒙古科技大学土木工程学院

出　　处：《材料导报》2020年第4期87-92,共6页Materials Reports

基　　金：内蒙古自治区自然科学基金面上项目(2016MS0112);内蒙古自治区高等学校科学研究项目(NJZY16156);内蒙古科技大学创新基金项目(2016QDL-B11)~~

摘　　要：采用钨电极非自耗电弧炉制备不同Yb 2O 3含量的Ti-1100铸态合金,利用高温炉配合WDW-300型电子万能试验机在温度为25~800℃、应变速率为10^-4~10^-2 s^-1下对合金进行压缩实验,研究了Yb2O3对Ti-1100合金力学性能的影响,并利用扫描电镜对合金微观组织的变化和压缩断口样貌进行观察。结果表明:在Ti-1100合金中加入Yb 2O 3可明显提升屈服强度,当温度为25~600℃时,Yb2O3含量为0.45%(质量分数,下同)的合金的压缩屈服强度提升最为理想;当温度达到800℃时,Yb2O3的含量为0.60%的合金的压缩屈服强度提升最为理想。Yb2O3可明显细化Ti-1100合金晶粒,并且使得合金α片层间距得到细化。当Yb2O3含量为0.45%时,合金的塑性变形能力明显增强。Ti-1100 as-cast alloys with different contents of Yb2O3 were prepared by tungsten electrode non-consumption arc furnace.The WDW-300 electronic universal testing machine was used to compress the alloy at temperatures of 25—800℃and strain rate of 10^-4—10^-2 s^-1.The effect of Yb2O3 on the mechanical properties of Ti-1100 as-cast alloy was investigated.Scanning electron microscopy was used to observe the microstructure changes and compression fracture appearance of the alloy.The results show that the yield strength of Ti-1100 alloy was improved obviously by the addition of Yb2O3.At 25—600℃,the alloy with Yb2O3 content of 0.45wt%had the best compression yield strength improvement.At 800℃,the alloy had the highest compressive yield strength when the Yb2O3 content is 0.60wt%.The grain size andαlamellar spacing of Ti-1100 alloy were refined obviously by adding Yb2O3.The plastic deformation ability of the alloy with Yb2O3 content of 0.45wt%is obviously enhanced.

关 键 词：YB2O3 Ti-1100合金 高温 力学性能 

分 类 号：TG146.2+3[一般工业技术—材料科学与工程]