LY12铝合金强流脉冲电子束表面改性层组织结构及性能  

Micro-structure and property of LY12 Al alloy irradiated by high current pulsed electron beam

作　　者：李刚[1] 赵云龙[1] 郝胜智[2] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,阜新123000 [2]大连理工大学三束材料改性教育部重点实验室,大连116024

出　　处：《核技术》2012年第7期507-511,共5页Nuclear Techniques

摘　　要：用强流脉冲电子束对LY12铝合金表面进行辐照处理,结果表明,处理后合金表面出现熔坑,随辐照次数增加,熔坑数量减少但直径变大;XRD分析表明改性层中存在-Al和CuMgAl2和CuAl2相,重熔层再结晶有择优取向。表面截面硬度增大,在一定深度处达最大值,而后随电子束沉积能量减少而开始下降。电化学腐蚀试验表明,辐照处理样品的自腐蚀电位从–0.63 V提高到–0.52 V,自腐蚀电流由1.09 10 7A降低至3.12 10 9A,耐腐蚀性能明显提高。LY12 aluminum alloy samples were modified by 3-25 times of high current pulse elec, tron beam （HCPEB） treatment at 23.4 or 27 kV. The number of melting craters in the irradiated sample surface decreased with increasing number of the pulses, and the crater size increased with the pulse number. XRD analysis of the virgin sample showed the major phase of α-Al and the secondary phases of CuMgAI2 and CuAl2, which disappeared partly in XRD patterns of the samples treated with the HCPEB of certain pulses. The microstructure refinement and preferred orientation of crystal planes could be observed in the HCPEB treated samples, and the surface micro-hardness increased to a maximum in certain depths, where it began to decrease because of reduced energy deposition in greater depths. Test results showed that the irradiated samples exhibited a remarkable property enhancement against electrochemical corrosion, with the corrosion potential increased from -0.63 V to -0.52 V and the corrosion cturent decreased by 2 orders of magnitude.

关 键 词：电子束 LY12 显微组织 显微硬度 电化学腐蚀 

分 类 号：TL503.92[核科学技术—核技术及应用]