Dose dependence of irradiation hardening of neutron irradiated vanadium alloys by using temperature control rig in JMTR
Dose dependence of irradiation hardening of neutron irradiated vanadium alloys by using temperature control rig in JMTR
复制标题
JMTR中使用温控装置进行中子辐照钒合金辐照硬化的剂量依赖性
DOI：
10.1016/j.nme.2016.03.010
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发表时间：
2016
影响因子：
2.6
通讯作者：
M. Narui
中科院分区：
文献类型：
--
作者：
K. Fukumoto;T. Onitsuka;M. Narui
在 JMTR 的温度控制装置中，对在 290 °C 下辐照的钒合金进行了 TEM 观察和拉伸试验，损伤程度为 0.003 至 0.06 dpa。随着中子剂量的增加，除V-5Nb合金之外的所有钒合金中都可以观察到辐照硬化。对于纯钒，辐照硬化与中子剂量之间的关系描述为 Δσ ∝(phit)0.35-0.53。对于V-5Cr合金和V-4Cr-4Ti-0.1Si合金，辐照硬化增加的剂量依赖性分别为Δσ∝(φt)0.8和Δσ∝(φt)0.8-1.0。从TEM观察来看，辐射引起的缺陷的硬化源主要确定为纯钒的位错环、V-5Cr的带空隙的环以及V-4Cr-4Ti-0.1Si和V-3Fe-4Ti-0.1Si合金的环和{100}析出物。从室温下测试的 V–4Cr–4Ti–0.1Si 合金的 8% 应力的应变率依赖性来看，应变率敏感性 m= 1/σ*(dσ/dln(dε/dt)) 显示为正值。因此，在室温至 290 °C 的温度范围内，V-4Cr-4Ti 合金中间隙杂质与位错之间的动态相互作用并不强。当夏比冲击试验表明室温下的脆性行为和拉伸试验表明室温下的延性行为时，0.068 dpa 辐照的 V-4Cr-4Ti-0.1Si 合金的变形模式存在差异。这可以通过拉伸试验和夏比试验屈服应力值的应变速率与临界断裂应力的差异来解释。
TEM observation and tensile test were examined for vanadium alloys irradiated in a temperature control rig in JMTR at 290 °C with damage level ranged from 0.003 to 0.06 dpa. With the increase of the neutron dose, irradiation hardening could be observed in all the vanadium alloys except for the V–5Nb alloy. In the case of pure vanadium, the relationship between irradiation hardening and neutron dose was described as Δσ ∝(ϕt)0.35-0.53. For V–5Cr alloy and V–4Cr–4Ti–0.1Si alloy, the dose dependence on irradiation hardening increase was shown as Δσ ∝(ϕt)0.8and Δσ ∝(ϕt)0.8-1.0, respectively. From the TEM observation, the hardening source of radiation-induced defects was mainly determined to be dislocation loops for pure vanadium, loops with voids for V–5Cr and, loops and {100} precipitates for V–4Cr–4Ti–0.1Si and V–3Fe–4Ti–0.1Si alloys. From the strain rate dependence of 8% stress for V–4Cr–4Ti–0.1Si alloys tested at RT, the strain rate sensitivity,m= 1/σ*(dσ/dln(dε/dt)) shows positive. Therefore, the dynamic interaction between interstitial impurities and dislocation is not strong in V–4Cr–4Ti alloys in the temperature range from RT to 290 °C. A discrepancy of deformation mode of irradiated V–4Cr–4Ti–0.1Si alloys with 0.068 dpa could be seen when the charpy impact test indicated the brittle behavior and the tensile test indicated the ductile behavior at room temperature. It can be explained by the difference of strain rate for the value of yield stress between tensile test and charpy test and the critical fracture stress.