论文部分内容阅读
研究了二元的和工业用钛合金中合金元素的辐照诱导偏析(以下简称RIS)。用2.1MeV Ar~+离子在500～700℃照射来模拟高温中子辐照效应。经过辐照的试样在近表面区所产生的溶质元素的偏析是用俄歇深度剖面技术测定的。晶格过小元素V,Mo,Al向陷穴偏聚。Nb、Ta的晶格尺寸稍大于基体Ti,几乎不偏析。晶格过大元素Z_r则偏离陷穴。所有这些实验结果是符合溶质尺寸效应规律的。意外的是Sn在Ti中是晶格过大元素,却很少偏析。Ti-3V和Ti-8Al-1Mo-1V两种合金试样的辐照后退火试验证实了V的偏析是辐照诱导的。偏析和温度及剂量关系的测定表明,V偏析在≈600℃时达到最大。在辐照初期阶段遵循抛物线增长规律,但在较低剂量时即已达到饱和。
The radiation induced segregation (hereinafter referred to as RIS) of alloying elements in binary and industrial titanium alloys was studied. 2.1MeV Ar ~ + ion irradiation at 500 ~ 700 ℃ to simulate high temperature neutron irradiation effect. The segregation of solute elements produced in the near-surface area of irradiated specimens was measured using the Auger depth profiling technique. Lattice is too small elements V, Mo, Al segregation to the subsidence. Nb, Ta lattice size slightly larger than the substrate Ti, almost no segregation. The lattice is too large element Z_r deviate from the trap. All these experimental results are in accordance with the law of solute size effect. Surprisingly, Sn is an oversized lattice element in Ti, but seldom segregates. Post-irradiation annealing experiments on Ti-3V and Ti-8Al-1Mo-1V alloy specimens confirmed that the segregation of V was induced by irradiation. Segregation and temperature and dose determination of the relationship shows that V segregation in ≈ 600 ℃ to reach the maximum. The law of parabolic growth follows the initial stage of irradiation, but reaches saturation at lower doses.