等温退火对辐照诱发的非晶TiNiCu合金微观组织结构的影响
Effect of isothermal annealing on microstructure of irradiation-induced amorphous TiNiCu alloys
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摘要: TiNiCu记忆合金在美国Argonne国家实验室IVEMTandem National Facility加速器产生的400keV Xe+离子辐照到0.4dpa时发生非晶化转变。通过电子显微镜研究了非晶化的TiNiCu合金的回复和再结晶过程。退火加热的速度是10℃/min。在280℃时非晶环附近出现电子衍射斑点以及明场像中出现少量析出相，表明回复和再结晶开始。退火到550℃出现多晶环，650℃时有片状马氏体变体生成，750℃时有很锐利的多晶环出现，表明再结晶过程基本完成。经标定再结晶晶粒仍然是TiNiCu记忆合金。再结晶组织与辐照前TiNiCu 合金的显微组织相比有较大差异。
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关键词:
- TiNiCu记忆合金 /
- 重离子辐照 /
- 回复 /
- 再结晶 /
- 原位电子显微观察
Abstract: Recrystallization of irradiationinduced amorphous TiNiCu alloys has been investigated by means of the in situ transmission electron microscopy (TEM). TiNiCu shape memory alloy samples were amorphized by 400keV Xe+ ions at room temperature using IVEMTandem Facility at Argonne National Laboratory. The recovery process of amorphization was observed upon annealing from room temperature to 750℃ at a rate of 10℃ /min by in situ TEM. The recrystallization started when annealing at 280℃ for 10 min and the diffraction spots appeared around the amorphous rings. The polycrystalline rings started to form at 550℃ and the recrystallization basically finished at 750℃. The polycrystalline rings are indexed to TiNiCu SMAs. The microstructure after the recrystallization is different from that of th-
Key words:
- tinicu shape memory alloy /
- heavy ion irradiation /
- amorphization /
- recrystallization /
- in situ tem
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