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Effect of Hydrogen on Diffusion Bonding Behavior and Mechanism of Ti-6Al-4V alloy
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Effect of Hydrogen on Diffusion Bonding Behavior and Mechanism of Ti-6Al-4V alloy
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    摘要:

    研究了置氫Ti-6AL-4V 合金在800~860 ℃溫度范圍內(nèi)氣壓擴(kuò)散連接行為與機(jī)理。在840 ℃對置氫0.11%（質(zhì)量分?jǐn)?shù)，下同）的純鈦和Ti-6AL-4V 合金進(jìn)行了擴(kuò)散連接。應(yīng)用光學(xué)顯微鏡（OM）、掃描電子顯微鏡（SEM）和電子探針顯微分析儀（EPMA）研究了氫對擴(kuò)散連接接頭焊合率及元素擴(kuò)散行為的影響。結(jié)果表明：氫能夠顯著提高擴(kuò)散連接接頭的焊合率（置氫0.11%在840 ℃的焊合率大于98%）；氫含量為0.11%的Ti-6Al-4V合金擴(kuò)散連接后仍為等軸組織，而高氫含量（0.32%~0.48%H）Ti-6Al-4V合金擴(kuò)散連接后組織轉(zhuǎn)變?yōu)榇执蟮奈菏辖M織；氫對擴(kuò)散連接行為的改善作用主要是由于氫的弱鍵效應(yīng)及其對元素擴(kuò)散系數(shù)的提高；相對于未置氫Ti-6Al-4V合金，0.11%的氫能夠?qū)l和V元素的擴(kuò)散系數(shù)提高一個數(shù)量級，并使擴(kuò)散連接溫度降低了40 ℃。

    Abstract:

    The hydrogenated commercially pure titanium and Ti-6AL-4V alloy with 0.11wt%H were diffusion-bonded in the temperature range from 800 to 860 °C. The interface and elements diffusion were observed by OM, SEM and EPMA. The results show that hydrogen significantly improves the rate of diffusion bonding (bonding rate is up to 98% under the condition of 0.11 wt%H at 840 °C). An equiaxed microstructure is maintained due to the addition of 0.11 wt%H after bonding while the higher amount of hydrogen (0.32 wt%~0.48 wt%H) results in a coarse widmanstatten structure. The improved performance of the diffusion bonding induced by hydrogen is mainly attributed to the weak-bond effect and the increase of diffusion coefficient of the elements. The addition of 0.11 wt%H brings one order increase of magnitude to the diffusion coefficient of Al and V element, as well as 40 °C lower diffusion bonding temperature compared with non-hydrogen Ti-6Al-4V alloy.

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李志強(qiáng),韓 坤,侯紅亮,王寶雨,胡正寰. Effect of Hydrogen on Diffusion Bonding Behavior and Mechanism of Ti-6Al-4V alloy[J].稀有金屬材料與工程,2014,43(2):306~310.[Li Zhiqiang, Han Kun, Hou Hongliang, Wang Baoyu, Hu Zhenhuan. Effect of Hydrogen on Diffusion Bonding Behavior and Mechanism of Ti-6Al-4V alloy[J]. Rare Metal Materials and Engineering,2014,43(2):306~310.]
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  • 收稿日期:2013-02-20
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  • 在線發(fā)布日期: 2014-06-03
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