不同超细氧化物掺杂钼合金棒材的拉伸性能及强化机理  

Evaluation of tensile property and strengthening mechanism of molybdenum alloy bars doped with different ultrafine oxides

作　　者：徐流杰[1,2] 孙铁龙 周玉成[2] 李洲 魏世忠[1] Liu-jie XU;Tie-long SUN;Yu-cheng ZHOU;Zhou LI;Shi-zhong WEI(Henan Key Laboratory of High-temperature Structural and Functional Materials,Henan University of Science and Technology,Luoyang 471003,China;National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang 471003,China;Beijing National Innovation Institute of Lightweight Ltd.,China Academy of Machinery Science and Technology,Beijing 100089,China)

机构地区：[1]河南科技大学河南省高温结构与功能材料重点实验室,洛阳471003 [2]河南科技大学金属材料磨损控制与成型技术国家地方联合工程研究中心,洛阳471003 [3]中国机械科学研究总院北京机科国创轻量化科学研究院有限公司,北京100089

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第10期3083-3099,共17页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.U1804124,U1704152)。

摘　　要：通过水热合成、共沉淀、共分解、粉末冶金和旋锻方法制备了3种掺杂2.0%(体积分数)不同氧化物(Al_(2)O_(3)、ZrO_(2)和La_(2)O_(3))的钼合金棒材。3种纳米氧化物均使钼晶粒细化70%以上,且使合金的断裂模式从脆性断裂转变为韧性断裂,从而显著提高钼合金的综合力学性能,克服强度和韧性之间的矛盾。在3种钼合金中,Mo-ZrO_(2)合金具有最佳的强度和塑性,这归因于细小的ZrO_(2)颗粒以及ZrO_(2)与钼基体之间的半共格界面。此外,建立了与位错密度、氧化物体积分数和尺寸以及钼晶粒尺寸相关的定量强化模型。Three kinds of molybdenum alloy are doped with 2.0 wt.%different ultrafine oxide particles(Al_(2)O_(3),ZrO_(2)and La_(2)O_(3))via hydrothermal synthesis,co-precipitation,co-decomposition,powder metallurgy,and rotary swaging.Three nano-oxides refine molybdenum grains by more than 70%and change the fracture modes from brittle fracture to ductile fracture,thereby dramatically improving the integrated mechanical properties of the alloys.Moreover,the trade-off between strength and ductility is offset.Mo−ZrO_(2)alloy has the highest strength and plasticity,which is attributed to fine ZrO_(2)particles and a semi-coherent interface between ZrO_(2)and molybdenum matrix.Moreover,a quantitative strengthening model correlating dislocation density,oxide volume fraction and size,and molybdenum grain size is established.

关 键 词：钼合金 Al_(2)O_(3) ZrO_(2) La_(2)O_(3) 强塑积 强化模型 

分 类 号：TG146.412[一般工业技术—材料科学与工程]