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熱處理對鈾鈮合金變形局域化的影響
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中國工程物理研究院科學發(fā)展基金 (2010B0301046)


Effects of Heat Treatment on Microstructure and Dynamic Shear Localization
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    摘要:

    對多溫度點人工時效(200 ℃/2 h、400 ℃/2 h、600 ℃/2 h)鈾鈮合金在沖擊載荷作用下的絕熱剪切帶形成機理進行了研究，采用Hopkinson壓桿裝置對鈾鈮合金帽形樣品進行了沖擊加載，利用光學顯微鏡和掃描電鏡對沖擊后的回收樣品進行了顯微組織觀察。結果表明，顯微組織對剪切帶的形成具有重要影響，只在200 ℃/2 h與600 ℃/2 h帽形樣品臺階處觀察到不同類型的絕熱剪切帶，400 ℃/2 h樣品在沖擊過程表現(xiàn)出韌性斷裂與脆性斷裂的特征，某些區(qū)域已經接近或達到熔點

    Abstract:

    Dynamic deformation and failure behavior of U-Nb alloy with different heat treatment (200 oC/2 h, 400 oC /2 h, 600 oC /2 h) were studied. Hat-shape specimens were used in an attempt to induce strain localization in U-Nb alloy. Dynamic load was applied to specimens by use of a Split Hopkinson Press Bar (SHPB) apparatus. The microstructure was examined by optical microscopy and scanning electron microscopy. Results show that the appearance of adiabatic shear bands (ASBs) is relative to the microstructure of material. Different kinds of ASBs are found in 200 oC/2 h and 600 oC/2 h specimens, while specimens (400 oC/2 h) exhibit dimple-like feature, indicating that significant melting takes place during deformation under high strain rate loading condition

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石 潔,王小英,趙雅文,巫祥超.熱處理對鈾鈮合金變形局域化的影響[J].稀有金屬材料與工程,2014,43(11):2836~2840.[Shi Jie, Wang Xiaoying, Zhao Yawen, Wu Xiangchao. Effects of Heat Treatment on Microstructure and Dynamic Shear Localization[J]. Rare Metal Materials and Engineering,2014,43(11):2836~2840.]
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  • 收稿日期:2013-11-18
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  • 在線發(fā)布日期: 2015-04-07
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