热变形ndfeb稀土永磁材料组织和织构的研究

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1、内蒙古科技大学硕士学位论文摘要本文研究了热变形NdFe—B稀土永磁材料的铸锭组织和热变形过程中组织与织构的变化。合金在真空中频感应炉冶炼，随后进行不同工艺的热变形及热处理。然后观察显微组织，采用X射线衍射的方法分析织构的变化。结果表明：NdFe—B合金铸锭中Nd。Fe，；B相生长成片状晶，若干个彼此近似平行排列的片状晶组成一个片状晶团。热压变形可绌化主相晶粒，且随着形变量的增大，主相Nd：Fe．。B晶粒进一步细化，同时富Nd相沿品界均匀分布。富Nd相在热压时可呈液相，液态的富Nd晶界相在热变形过程中起润滑作用，有利于主相晶粒的转动和位

2、移。热处理之后边界显微结构得到改善。在700℃，形变速率为10-,～10-3／s的热压变形工艺下，得到以(006)晶面的衍射峰为主峰的织构，即(006)织构，随形变量的增大，(006)织构进一步增强。初始织构对热变形NdFe—B永磁合金的磁织构有很重要的影响，当试样的初始织构不显著时，热轧变形后Nd—Fe—B永磁合金的磁织构增强，当试样有非常发达的初始织构时，热轧变形后的Nd—Fe—B永磁合金的磁织构减弱。关键词：Nd—Fe—B；稀土永磁；热变形；织构内蒙占科技大学硕士学位论文StudyonMicrostructureandMagne

3、ticTextureofHot-deformedNdFeBRareEaChPermanentMagnetsAbstractIhemieroslruetureofNd—Fe-Bingotandtheinfluenceofhot-deformati013onmicrostmctureandmagnetictextureofNd—Fe-Bpermanentmagneticalloyswerestudied．Thealloysweresmeltedinvacuumintermediate—frequencyinductionfBrnace，t

4、henthesampleswerehotdeformedandcarriedthroughheattreatment．MicroslrucmrewasobservedandtexturewasangledbyX-raydiffraction．ResultsshowthatthegrowthofNd2Fel413粤缸md咖gsolidificationisinsheet—likepatternandseveralnearlyparalMlathesformagroupofsheet．Hot-pressingdeformationrefi

5、nesthegrainsandwimtheincrementofdeformationratio．theNd2Fej4BgrainsarefilrtherrefinedandNd前chphaseisinwell-proportioneddistributionalongthecrystalboundary．Nd-richphaseduringhot-pressingdeformationisinliquidstateanditplaysalubricantroleinhot-pressingdeformationinordertoma

6、keNd2Fel413gramsrotateandrllovebeneficially．Heattreatmentimprovesthecrystal1)oundarymicrostrueture．(006)textureisobtainedbyhot-pressingdeformationat700。Cwithadeformationrateof10-4～10—3／sand，withtheincrementofdeformationratio，(006)textureisfllrtherstrengthened．Inaddition

7、，theinitialtextureofNd-Fe-Bingotisveryimportanttoformmagnetictextureduringhot-deformation．Hot-rollingdeformationmayincreasethemagnetictextureofNd—Fe—Bmagnetswhentheinitialtextureisnotverypronounced．Conversely,aningotwithawell—developedinitialtexturemayhaveitsmagnetictex

8、turedecreasedbyrolling．KeyWords：Nd-Fe—B：rareearthpermanentmagnets；hotdeformation；texture．2。独创性说明本人郑重声明：所呈交的沦文是