Changes in the magnetic and mechanical properties of thermally aged Fe-Cu alloys due to nano-sized precipitates
Changes in the magnetic and mechanical properties of thermally aged Fe-Cu alloys due to nano-sized precipitates
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DOI：
10.1088/0022-3727/49/3/035006
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发表时间：
2016-01-27
影响因子：
3.4
通讯作者：
Liu, Wei
中科院分区：
文献类型：
--
作者：
Li, Yi;Li, Yuanfei;Liu, Wei
为了加深对反应堆压力容器(RPV)辐照脆性的磁性无损评价的基本认识，研究了Fe-Cu合金在热时效过程中磁性能、力学性能和显微组织参数的变化。在500℃热时效不同时间后，从铁基中析出了纳米铜颗粒，并测定了其微观结构参数。测量了样品的矫顽力、巴克豪森噪声(BN)、维氏硬度和屈服应力。随着时效时间的延长，这些性能呈现出相同的硬化-软化趋势，这可以用基于析出物钉扎在畴壁和位错模型上的组织参数的演变来解释。这些结果表明，利用磁技术对RPV的辐照脆化进行无损检测是可行的。
The changes in the magnetic properties, mechanical properties, and microstructural parameters of Fe-Cu alloys due to thermal aging have been investigated to improve the fundamental understanding of using magnetic technology for the nondestructive evaluation (NDE) of irradiation embrittlement in the reactor pressure vessel (RPV). Nano-sized Cu particles precipitated from a Fe matrix after thermal aging at 500 degrees C for various times, and the microstructure parameters were determined. The coercivity, Barkhausen noise (BN), Vickers hardness, and yield stress were also measured for these samples. These properties show the same hardening-softening trend with increasing aging time, which can be interpreted in terms of the microstructure parameters evolution based on the model of the pinning of precipitates on domain walls and dislocations. These results suggest the practicability of using magnetic technology for the NDE of the irradiation embrittlement of the RPV.