李瑛
,
林海潮
,
曹楚南
中国腐蚀与防护学报
利用扫描隧道显微镜观察了大气条件下FeNiSiB非晶合金在自然大气环境下腐蚀前后表面的微观形貌特征,并对所获结果进行分析,以探讨非晶合金的微观结构与大气腐蚀行为的关系。结果表明:实验所用非晶材料的微观结构是由几个原子首先组成2纳米左右的颗粒团,此颗粒团经无序密堆,最后形成非晶合金。非晶合金结构具有自仿性,在微米、纳米尺度具有相同的分维数;在大气中非晶合金以2纳米左右的颗粒团为基本单元发生均匀腐蚀,且腐蚀前后非晶合金表面具有相同的分维数。
关键词:
大气腐蚀
,
Amorphous alloys
,
STM
,
Fractal dimension
H.S. Fang and C. Zhang Departmentof Materials Science and Engineering
,
Tsinghua University
,
Beijing 100084
,
China
金属学报(英文版)
The viewpoints aboutthe formation mechanism of bainite are described asfollowing aspects: ①Ultra finestructureof bainitein ferrous and nonferrousalloysis discovered by scanningtunneling microscopy (STM) .②STMstudies discoveredthatthesurface relief of bainiteissubstantiallycomposed of groupsofsmallrelieves which correspond of ultra fineunits,theirsurfacereliefistent shaped.③The frequency and mobility of 3 dimensionalsuperledgesinferrousand nonferrousareproved by TEMand STM.④Thebainitecarbide nucleateinthe ∪ sideof α/γinterfaceand grow toward austenite,thegrowth of carbide and ferrite arecom petitive.⑤STMstudies on surface relief of grain boundary allotriomorph ( GBA) andWidmansttten ferrite( WF) . They aretent shaped.⑥Theformation of bainiteisthroughsympathetic nucleation ledgewisegrowth mechanism .And both processesarecompetitive.⑦3 dimensional morphology of upper bainitetransformscontinuously to lower bainite, and noabruptlychange.
关键词:
bainite
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