晁代义
,
徐仁根
,
马海云
,
王根启
,
邵文柱
材料导报
通过OM、SEM、力学试验以及电化学试验研究了固溶温度对核电海水循环泵叶轮用双相不锈钢材料GX2CrNiMoN22-5-3组织及性能的影响.结果表明:在1050～1250℃固溶,γ相呈岛状或长条状弥散分布在α相基体上,α相含量随固溶温度的升高而增大,组织中无析出相出现,而抗拉强度大都在700MPa左右,拉伸断口形貌以韧窝为主,随固溶温度的升高,韧窝逐渐变浅变大.不同固溶温度下的点蚀电位保持在1.0V以上,在1150℃和1200℃时有较好的抗点蚀性能.
关键词:
双相不锈钢
,
α相
,
γ相
,
韧窝
,
抗点蚀性能
惠迎雪
,
樊慧庆
,
刘卫国
材料导报
采用真空热蒸发技术在单晶硅基底上沉积PVDF薄膜.通过分析阻蒸温度对薄膜沉积速率和真空室气压变化的影响研究了PVDF镀膜过程.同时利用傅立叶变换衰减全反射红外光谱(ATR-FTIR)、X射线衍射(XRD)和差热分析(DSC)对薄膜的晶型结构进行了表征分析,结果发现,真空热蒸发技术可制备具有高度取向性的α晶相PVDF薄膜,且薄膜中不舍C=C键.相比于PVDF树脂粉末,所得薄膜的结晶度明显增大而分子量显著减小,实现了PVDF薄膜的低维化制备.
关键词:
PVDF薄膜
,
取向生长
,
真空热蒸发
,
α相
,
薄膜结构
GAO Yan LI Dejun CAO Zhiben Dalian University of Science and Technology
,
Dalian
,
Liaoning
,
China LI Dejun
,
Lecturer
,
Department of Materials Engineering
,
Dalian University of Science and Technology
,
Dalian
,
Liaoning
,
China
金属学报(英文版)
The microstructure of Cr_(25)Ni_(20)stainless steel under plastic deformation up to 50% has re- vealed an even distributed twins,micro-twins and deformation bands.The σ-phase formation in 800℃ aged specimens is accelerated by its nucleation at either deformation twins or recrystallized grain boundaries under less or more deformation respectively.In the recrystallized zone,the recrystallization is prior to the precipitation of σ-phase.Although recrystallization may accelerate the formation of σ-phase,it is not essential.The twins and micro-twins produced by deformation may also provide the additional nucleation sites.
关键词:
plastic deformation
,
null
,
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