Evaluation of ultra-fine grained tungsten under transient high heat flux by high-intensity pulsed ion beam

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• 作者：Jun TAN^a ; Zhang-jian ZHOU^a ; ^{zhouzhj@mater.ustb.edu.cn} ; Xiao-peng ZHU^b ; Shuang-quan GUO^c ; Dan-dan QU^a ; Ming-kai LEI^b ; Chang-chun GE^a
• 关键词：tungsten ; tungsten alloy ; ultra-fine grain ; surface effects ; thermal shock ; transient high heat flux
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：May, 2012
• 卷：22
• 期：5
• 页码：1081-1085
• 文件大小：1245 K

摘要

Pure tungsten, oxide dispersion strengthened tungsten and carbide dispersion strengthened tungsten were fabricated by high-energy ball milling and spark plasma sintering process. In order to evaluate the properties of the tungsten alloys under transient high heat flues, four tungsten samples with different grain sizes were tested by high-intensity pulsed ion beam with a heat flux as high as 160 MW/(m²路s^鈭?/2). Compared with the commercial tungsten, the surface modification of the oxide dispersion strengthened tungsten by high-intensity pulsed ion beam is completely different. The oxide dispersion strengthened tungsten shows inferior thermal shock response due to the low melting point second phase of Ti and Y₂O₃, which results in the surface melting, boiling bubbles and cracking. While the carbide dispersion strengthened tungsten shows better thermal shock response than the commercial tungsten.