简介:W-25Cualloysweremicrowavesinteredina2.45GHzmultimodeapplicator.Thedensification,microstructureandtheirdependenceonsinteringmodeandFeadditionwereinvestigatedindetail.Owingtothevolumetricheatingintrinsicinmicrowaveprocessing,amicrostructurewithlargerWgrainsizeincenterregionswasobservedasagainstlargergrainsizeinedgeregionsforconventionalsintering.Microwavesinteringdemonstratesitsintrinsicadvantagessuchasrapidheatingrate,densificationenhancementandmicrostructuralhomogeneity;butitundesirablypromotesWgraingrowth.Undermicrowavesintering,theroleofFeadditiononcompactconsolidationisnotsosubstantialasunderconventionalsintering.MoreoverFedegradesthemicrostructuralquality,generatingworseuniformityandcoarserWgrains.
简介:
简介:由热退火的非结晶的Mg65Cu25Gd10合金和结构的变化的本地原子结构被扩大X光检查吸收罚款结构(EXAFS)学习了。在为Mg65Cu25Gd10合金的结构的变化和机械性质之间的关联也被讨论了。结果证明在在Mg65Cu25Gd10的Gd附近的Cu原子在退火期间很快输了,导致Cu原子的分离。Mg65Cu25Gd10的协作数字NGd-Mg首先在373K退火了减少然后随退火的增加扩充了时间。形成多面短期顺序在Gd原子附近与将近12的协作数字联合起来赞成机械性质的改进。化学药品短期顺序,不是拓扑短期在非结晶的Mg65Cu25Gd10合金的顺序在退火期间有明显的变化。