Abstract The damage evolution in equiatomic NiCoCr single crystals irradiated at 138 and 500 K with 1.5 MeV Ni+ ions has been investigated using ion channeling analysis and compared with previous results obtained at 300 K under identical irradiation conditions. As expected, irradiation temperature has a major influence on damage evolution and long-range effects in ion-irradiated NiCoCr. A change in relative irradiation resistance as a function of temperature is revealed when the ion channeling data are compared with previous ion channeling results from Ni-irradiated NiFe at 150, 300 and 500 K. NiCoCr has superior irradiation resistance than NiFe under ion irradiation at ≤ 300 K; surprisingly, the relative irradiation resistance is reversed under ion irradiation performed at > 300 K (i.e., 500 K), which may be attributed to local chemical ordering. These observations indicate that the NiFe alloy exhibits a more favorable chemical environment for suppressing deleterious microstructural degradation under high temperature irradiation than the NiCoCr alloy.

中文翻译：

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温度对离子辐照 NiCoCr 浓固溶体合金损伤演化的影响

摘要 使用离子通道分析研究了在 138 和 500 K 下用 1.5 MeV Ni+ 离子辐照的等原子 NiCoCr 单晶的损伤演变，并与在相同辐照条件下在 300 K 下获得的先前结果进行了比较。正如预期的那样，辐照温度对离子辐照 NiCoCr 的损伤演变和长程效应有重大影响。将离子通道数据与 150、300 和 500 K 下 Ni 辐照的 NiFe 的先前离子通道结果进行比较时，显示了相对辐照电阻随温度的变化。NiCoCr 在 ≤ 离子辐照下具有优于 NiFe 的辐照抗性300K；令人惊讶的是，在> 300 K（即500 K）下进行的离子辐照下，相对辐照电阻发生了逆转，这可能归因于局部化学排序。这些观察结果表明，与 NiCoCr 合金相比，NiFe 合金表现出更有利的化学环境来抑制高温辐射下有害的微观结构退化。