INTERACTIONS BETWEEN La_(2)O_(3) PARTICLES AND DISLOCATIONS IN Mo-La_(2)O_(3) ALLOYS  

作　　者：J.X. Zhang D.M. Liu Y. Q. Liu M.L. Zhou T. Y. Zuo 

机构地区：[1]The Key Laboratory of Advanced Functional Materials, Ministry of Education,Beijing University of Technology, Beijing 100022, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2005年第6期714-718,共5页金属学报（英文版）

基　　金：supported by the National Key Basic Research and Development Programme of China(No.G1998061316);Beijing Science Star Foundation

摘　　要：The mechanical properties of molybdenum wires doped with different contents of La2O3 were investigated systematicaUy and the interaction between La2O3 particles with dislocations in Mo- La2O3 wires were observed by SEM and TEM. It is shown that Mo-La2O3 wires possess much higher tensile strength than the pure Mo. In wires the dislocation motion is strongly hindered by La2O3 particles, which remains up to much higher temperature. Moreover, a number of prismatic dislocation loops and hexagonal dislocation network have been formed in annealed Mo-La2O3 wires. The higher strength of Mo-LazOs than the pure Mo is attributed to the La2O3 particles dispersion strengthening and dislocation strengthening.The mechanical properties of molybdenum wires doped with different contents of La2O3 were investigated systematicaUy and the interaction between La2O3 particles with dislocations in Mo- La2O3 wires were observed by SEM and TEM. It is shown that Mo-La2O3 wires possess much higher tensile strength than the pure Mo. In wires the dislocation motion is strongly hindered by La2O3 particles, which remains up to much higher temperature. Moreover, a number of prismatic dislocation loops and hexagonal dislocation network have been formed in annealed Mo-La2O3 wires. The higher strength of Mo-LazOs than the pure Mo is attributed to the La2O3 particles dispersion strengthening and dislocation strengthening.

关 键 词：MOLYBDENUM La2O3 dislocation strengthening 

分 类 号：TG146.412[一般工业技术—材料科学与工程]