Helium accumulation in metals during irradiation - where do we stand?
Helium accumulation in metals during irradiation - where do we stand?
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DOI：
10.1016/j.jnucmat.2003.09.001
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发表时间：
2003-12-01
影响因子：
3.1
通讯作者：
Singh, BN
中科院分区：
文献类型：
--
作者：
Trinkaus, H;Singh, BN
在本贡献中，回顾了与模拟金属中氦积累相关的基本思想。早期工作的主题包括：辐照下原子 He 的扩散和气泡成核、低温（扩散控制）与高温（解离控制）成核、级联诱导 He 分辨率和高剂量下的连续气泡成核、整体均匀成核与扩展缺陷处的异质成核；退火、迁移和聚结时的气泡粗化与奥斯特瓦尔德熟化；气泡状态、上限与“平衡”压力、He 的高压状态方程、应力或辐照引起的有效空位过饱和下的气泡到空隙的转变。最近的主题是：某些金属和陶瓷中 He 片晶（He 填充的纳米裂纹）的形成和生长限制，以及气泡环复合物的双组分奥斯特瓦尔德熟化。简要讨论了气泡形成对机械性能的可能影响：硬化和脆化，特别是在高温下，气泡转变为晶界处的空隙而引起晶间断裂。最后，确定了重要但尚未解决的问题，并简要讨论了它们的相关性。 (C) 2003 Elsevier B.V. 保留所有权利。
In the present contribution, the basic ideas pertinent to modelling helium accumulation in metals are reviewed. Topics of earlier work are: Diffusion of atomic He and bubble nucleation under irradiation, low temperature (diffusion controlled) vs. high temperature (dissociation controlled) nucleation, cascade induced He resolution and continuous bubble nucleation at high doses, homogeneous in the bulk vs. heterogeneous nucleation at extended defects; bubble coarsening upon annealing, migration and coalescence vs. Ostwald ripening; bubble state, upper limit vs. 'equilibrium' pressure, high pressure equation of state of He, bubble-to-void transformation under a stress or irradiation induced effective vacancy supersaturation. More recent topics are: formation and growth limitation of He platelets (He-filled nano-cracks) in some metals and ceramics, coupled two-component Ostwald ripening of bubble-loop complexes. Possible effects of bubble formation on mechanical properties are briefly addressed: hardening and embrittlement, particularly at high temperature where intergranular fracture is induced by the transformation of bubbles to voids at grain boundaries. Finally, important but unsolved problems are identified and their relevance are briefly discussed. (C) 2003 Elsevier B.V. All rights reserved.