ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The oxide lanthanum dispersion strengthened molybdenum alloys were prepared byproprietary powder metallurgy technology, in which the Mo-La2O3 powders were prepared byliquid-liquid doping process which the oxide lanthanum was added to ammonium bi-molybdatesolutions as aqueous solutions of La(NO3)3 and liquid-solid doping process which the oxidelanthanum was added to molybdenum oxide solid particles as aqueous solutions of La(NO3)3,respectively. The microstructure and tensile properties of the molybdenum alloys were investigated atroom temperature. The results show that the molybdenum alloys all have fine molybdenum grains,and the molybdenum alloy prepared by liquid-solid doping process mainly contain fine oxidelanthanum particles of submicron and nano-sized while the alloy prepared by liquid-liquid dopingprocess mainly contain nano-sized fine oxide lanthanum particles. The molybdenum alloys preparedby liquid-liquid doping process have higher yield strength and ductility than yield-solid dopingprocess. The results of strengthen mechanism analysis show that the high strength of themolybdenum alloys can be advisablely explained by the fine grain strengthening and particlesdispersion strengthening mechanism through the Hall–Petch relationship and Orowan model
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.481.pdf
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