Diffusion of zirconium in aluminum
Diffusion of zirconium in aluminum
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DOI：
10.2464/jilm.23.17
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发表时间：
1973
期刊：
影响因子：
--
通讯作者：
Terumi Marumo;S. Fujikawa;K. Hirano
中科院分区：
文献类型：
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作者：
Terumi Marumo;S. Fujikawa;K. Hirano
用剩余活度法测定了Zr在99.999%纯铝、Al-0.063at%Fe合金和Al-0.18at%Si合金多晶试样中的扩散系数。本文用液-液萃取技术从含草酸的锆-95-铌-95混合物中提纯锆-95示踪剂。锆-95示踪剂以氯化物ZrCl 4的形式沉积在样品上。金属示踪剂是在扩散退火初期由氯化物与Al反应生成的。在上述过程中产生的氯气充当蚀刻剂，从表面去除薄氧化物膜，从而允许示踪剂扩散到本体中而不受表面氧化物层的阻碍。Zr在99.999%纯铝中在531°C和640°C之间的温度范围内的扩散率表示为D =（7.28+10.4-4.29）×102exp{-Zr在Al-0.063 at% Fe合金中在555°C和640°C之间的温度范围内的扩散率和在Al-0.18 at% Si合金中在531°C和649°C之间的温度范围内的扩散率由D =（57.8±1.55）Kcal/mol/RT} cm 2/sec给出。D =（5.48+75.1-5.11）× 105exp {-（69.1±3.04）Kcal/mol/RT} cm 2/sec。锆在99.999% Al、Al-0.063 at% Fe合金和Al-0.18% Si合金中扩散的指前因子和激活能与Fe、Mn和Cr在纯铝中扩散的指前因子和激活能非常相似。
Diffusivities of Zr in polycrystalline specimens of 99.999% pure aluminum, Al-0.063 at% Fe alloys and Al-0.18 at% Si alloys were determined by the residual-activity method with the radioactive tracer, Zirconium-95. The zirconium-95 tracer used in the present work was purified from a zirconium-95-niobium-95 mixture containing oxalic acid with a liquid-liquid extraction technique5). The zirconium-95 tracer was deposited onsamples in the form of the chloride ZrCl4. The metallic tracer was produced by the reaction of the chloride with Al in the initial stage of diffusion annealing. The chlorine gas produced in the above process acted as an etchant, removing a thin oxide film from the surface and thereby allowing the tracer to diffuse into the bulk without impediment by the surface oxide layer.The diffusivity of Zr in 99.999% pure aluminum in the temperature range between 531°C and 640°C was expressed asD=(7.28+10.4-4.29)×102exp{-(57.8±1.55)Kcal/mol/RT}cm2/sec.The diffusvities of Zr in Al-0.063 at% Fe alloys in the temperature range between 555°C and 640°C and that in Al-0.18 at% Si alloys in the temperature range between 531°C and 649°C were given byD=(3.43+8.78-2.47)×10exp{-(52.1±2.18)Kcal/mol/RT}cm2/secandD=(5.48+75.1-5.11)×105exp{-(69.1±3.04)Kcal/mol/RT}cm2/sec, respectively. The pre-exponential factor and the activation energy for diffusion of zirconium in 99.999% Al, Al-0.063 at% Fe alloys and Al-0.18% Si alloys were very similar to those for diffusion of Fe, Mn and Cr in pure aluminum.