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超磁致伸缩合金TbDyFe的晶体生长过程 总被引:1,自引:0,他引:1
用超高温度梯度真空悬浮区熔定向凝固法制备了TbDyFe超磁致伸缩合金,研究了TbDyFe合金的晶体生长方式、轴向择优取向和磁致伸缩性能.结果表明:用悬浮区熔法可制备出轴向择优取向为<110>方向和<113>方向的TbDyFe合金;在20MPa的预应力和5l7.5kA·m-1的磁场下,取向为<110>和<113>的合金样品的磁致伸缩系数分别为l.8×10-3和1.6×10-3.随着生长速度的增大,TbDyFe合金由小晶面生长方式向非小晶面生长方式转变;使用取向为<110>或<113>的晶粒作籽晶,能加快晶粒的择优竞争生长,有利于<110>方向或<113>方向的轴向择优取向的形成;高温退火能不同程度地提高合金的磁致伸缩性能. 相似文献
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1IntroductionNi Ti shape memory alloy had superordinary superelasticity,shape memory property,biocompatibility,corrosion resistance and they have been applied extensively in aeronautics,aerospace,medical apparatusand instruments,and many other fields[1].The transformation behavior,shape memory effect,superelasticof Ni Ti shape memory alloy have been studied[2].It was founded that shape memory alloy had not onlyshape recovery but also recovery stress.However,studies of microstructure and the … 相似文献
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1IntroductionPul monary embolism(PE),also called lung embolism,is the clinical pathological physiological syn-drome of the dyshemia in the lung caused by thrombus or other kinds of embolus clogging the pul monaryartery andits branches.In75%-90%of the cases,pul monary artery embolus hasits sourceinthe veinsinlower li mbs and the cavitas pelvis.The thrombus amotioes fromthe vein andis sent to the cor dextrumbybloodstream.At last it reaches the pul monary artery andthus pul monary embolismcomes … 相似文献
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