氧化镧钼板的高温拉伸性能  

High temperature tensile properties of Mo-La_2O_3 sheet

作　　者：段素红[1] 张国赏[1,2] 魏世忠[1,2] 彭光辉 徐流杰[1,2] 

机构地区：[1]河南科技大学材料科学工程学院,河南洛阳471003 [2]河南科技大学河南省耐磨材料工程技术研究中心,河南洛阳471003 [3]洛阳高科钼钨材料有限公司,河南洛阳471000

出　　处：《材料热处理学报》2011年第12期29-33,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然基金资助(50972039);河南省重大科技专项(092102213111);洛阳市科技计划项目(0601026A)

摘　　要：采用液-液掺杂并结合粉末冶金的方法制备了不同稀土氧化镧含量(0.5%～1.5%)的掺杂钼坯,轧制成钼板材后,研究了钼板高温拉伸性能,并利用SEM、EDS和显微镜对钼合金的组织和断口形貌进行了分析。结果表明:氧化镧不仅细化了钼合金晶粒,还提高了钼板的再结晶温度,在1200℃,纯钼板晶粒基本长成等轴晶,而氧化镧钼板的晶粒细小且长径比大。随着氧化镧掺杂量的提高,氧化镧钼板强度逐渐增大,而伸长率在掺杂量为1.0%时最佳。纯钼板在1000℃之后转成脆性断裂,而氧化镧钼板在试验温度范围内始终是塑性断裂。Rare earth oxide-doped molybdenum billet were prepared by liquid-liquid doping and powder metallurgy process,and then rolled into sheets.The effect of La2O3 on high temperature tensile properties of Mo-La2O3 sheets was researched.The fracture surface of Mo-La2O3 sheets and the rare earth phase were analyzed by means of XRD,SEM,EDS and tensile test.The results show that La2O3 not only refines grains of Mo-La2O3 alloy,but also increases recrystallization temperature of the molybdenum sheets.At 1200 ℃,the grains of pure molybdenum sheet grow into equiaxed grains,while finer grains with larger aspect ratio in the Mo-La2O3 sheets are observed.With increasing the content of La2O3,tensile strength of the Mo-La2O3 sheets significantly increases,the maximum elongation of Mo-1.0%La2O3 sheet is obtained.The fracture surface of Mo-La2O3 sheets exhibits ductile fracture features at 900-1200 ℃.However,the pure molybdenum sheet shows brittle fracture characteristics at temperature higher than 1000 ℃.

关 键 词：氧化镧钼板 氧化镧 高温拉伸 再结晶 

分 类 号：TG146.4[一般工业技术—材料科学与工程]