论文标题
高强度质子束暴露下双相钛合金的拉伸行为：辐射诱导的TI-6AL-4V中的欧米茄相变
Tensile behavior of dual-phase titanium alloys under high-intensity proton beam exposure: radiation-induced omega phase transformation in Ti-6Al-4V
论文作者
论文摘要
在Brookhaven Linac同位素生产设备上，在各种材料标本上，用于加速器靶向应用，包括钛合金作为梁窗户材料在内的各种材料标本上，在布鲁克黑文同位素生产设备上进行了181 MEV能量的高强度质子束暴露。分析胶囊的辐射损伤水平在梁中心区域为0.25 dpa，辐照温度约为120度。拉伸测试表明，双重α+β相TI-6AL-4V-4V级5级5级和23级的低使allpha-nill n dill a nellpha-nills ti-nimers ti-nibase ti-nibase ti-nibase ti-355.5555.辐照后几个％的伸长率。 TI-6AL-4V上的透射电子显微镜分析表明，在每个α相晶粒中大小小于2 nm的缺陷簇密度的明确证据。 β相晶粒不包含任何可见的缺陷，例如环或黑点，而衍射模式清楚地表明在高级地层阶段中表明欧米茄阶段的沉淀。与TI-3AL-2.5V合金相比，β期间辐射诱导的omega期转化可能会导致TI-6AL-4V合金中的延展性损失更大，而β相较少。
A high-intensity proton beam exposure with 181 MeV energy has been conducted at Brookhaven Linac Isotope Producer facility on various material specimens for accelerator targetry applications, including titanium alloys as a beam window material. The radiation damage level of the analyzed capsule was 0.25 dpa at beam center region with an irradiation temperature around 120 degree C. Tensile tests showed increased hardness and a large decrease in ductility for the dual alpha+beta-phase Ti-6Al-4V Grade-5 and Grade-23 extra low interstitial alloys, with the near alpha-phase Ti-3Al-2.5V Grade-9 alloy still exhibiting uniform elongation of a few % after irradiation. Transmission Electron Microscope analyses on Ti-6Al-4V indicated clear evidence of a high-density of defect clusters with size less than 2 nm in each alpha-phase grain. The beta-phase grains did not contain any visible defects such as loops or black dots, while the diffraction patterns clearly indicated omega-phase precipitation in an advanced formation stage. The radiation-induced omega-phase transformation in the beta-phase could lead to greater loss of ductility in Ti-6Al-4V alloys in comparison with Ti-3Al-2.5V alloy with less beta-phase.
