摘要
利用加速腐蚀实验方法研究了腐蚀对一种亚共析铀铌合金拉伸性能的影响,并用SEM和EDS对拉伸试样的组织结构、成分、表面形貌和断口形貌进行了分析。腐蚀实验表明:随着腐蚀时间的增加,拉伸试样表面的腐蚀程度加剧,经过约180d的腐蚀后,试样表面形成了腐蚀斑,其大小为50μm左右;力学拉伸测试表明:在实验范围内,合金的屈服强度和抗拉强度无明显变化,而试样的延伸率及断面收缩率则有下降的趋势。断口形貌表明,合金在实验范围内腐蚀后,其断裂方式仍以韧性断裂为主。此外,对引起合金力学性能变化的主要因素也进行了探讨。
The effect of corrosion on the mechanical properties of a hypoeutectoid U-Nb alloy has been investigated by accelerated corrosion tests. The microstructure, composition, surface and fracture morphology of the U-Nb alloy samples have been examined using SEM equipped with EDS. The results show that the degree of corrosion of tensile bars is increased with corrosion time, in which the corrosion pits of about 50μm in size on the sample surface have been observed after 180 day corrosion, and the yield strength and ultimate tensile strength of the sample under the experimental conditions is not change obviously, while the elongation and reduction in area decrease with the increase of corrosion time. It can be seen from the facture morphology of the samples that the fracture is predominantly governed by tough rupture. Moreover the main factors which could affect the mechanical properties of the alloy have also been discussed.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第8期1441-1445,共5页
Rare Metal Materials and Engineering
关键词
亚共析
U-Nb合金
力学性能
腐蚀
hypoeutectic
U-Nb alloy
mechanical property
corrosion
