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论文类型：期刊论文

发表时间：2012-02-01

发表刊物：17th International Conference on Ion Beam Modification of Materials (IBMM)

收录刊物：SCIE、EI、CPCI-S

卷号：272

页面范围：454-457

ISSN号：0168-583X

关键字：High-intensity pulsed ion beam; Stress wave; Thermal-dynamic effect; Surface modification; Titanium

摘要：A piezoelectric transducer based on lead-zirconte-titanate (PZT) piezoelectric ceramic thin plate was applied to characterize the stress waves in titanium targets under high-intensity pulsed ion beam (HIPIB) irradiation at a peak accelerating voltage of 350 kV and an ion current density up to 400 AW/cm(2) with pulse duration of about 150 ns. The magnitude of recorded stress wave signals was increased along with the irradiation intensity, presenting a slow growth with a value below 100 V in the range of 200-300 A/cm(2), and then a rapid increase of about four times up to 400 A/cm(2). The measured stress waves were explained by space-time diagram analysis. The generation and propagation of the stress wave can be attributed to the coupled thermal-dynamic effects during HIPIB irradiation onto metallic targets, where the thermal shock due to ultra-fast heating/cooling process and the recoil impulse due to ablation process have a combined contribution to the induced stress waves, dependent on the irradiation intensity. It is indicated that a fast attenuation of stress wave proceeded during its propagation from the irradiated surface to the target/PZT interface. The large amount of energy delivered by the stress wave effectively converted and dissipated into plastic deformation and/or defects formation in target materials. The dynamic response of metallic materials under HIPIB irradiation accounts for the effective surface modification of metals and alloys into a depth well beyond the ion range. (C) 2011 Elsevier B.V. All rights reserved.