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Ti／Al擴(kuò)散焊的接頭組織結(jié)構(gòu)及其形成規(guī)律
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TG453.9

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Structure and Forming Process of the Ti/Al Diffusion Bonding Joints
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    摘要:

    以TA2和L4為焊接材料進(jìn)行擴(kuò)散焊，結(jié)合剪切斷口形貌，XRD分析，SEM分析和接頭強(qiáng)度測(cè)試，研究了Ti／Al擴(kuò)散焊的接頭形成規(guī)律。結(jié)果表明，接頭形成過程包括互擴(kuò)散形成冶金結(jié)合、冶金結(jié)合區(qū)生成新相、新相顆粒長(zhǎng)大連接成片層、新相片層按照拋物線規(guī)律生長(zhǎng)4個(gè)階段。TiAl3是擴(kuò)散反應(yīng)的初生相，且在較長(zhǎng)時(shí)間內(nèi)是唯一生成相。它的生成具有一定延遲時(shí)間tD，tD受溫度影響很大。接頭強(qiáng)度取決于擴(kuò)散區(qū)中冶金結(jié)合的程度及界面結(jié)構(gòu)，在TiAl3新相連接成片層之后，接頭強(qiáng)度達(dá)到甚至超過L4型Al母材。接頭剪切斷裂發(fā)生在界面擴(kuò)散區(qū)的Al側(cè)或Al母材內(nèi)部。

    Abstract:

    Structure and forming process of the Ti/Al diffusion bonding joints were studied by means of scanning electron microscopy (SEM), X-ray diffractometry (XRD) and shear strength measurement. The TA2 and L4 were used as bonding couples. The results showed that the forming process of joints included four stages. The primary and unique phase was TiAl3 from the diffusion reaction for long time. There was a delay time tD before TiAl3 appeared, mainly affected by temperature. The joint strength depended on the metallurgical combination percentage and interface structure of diffusion zone, reaching or even exceeding the strength of L4 when the TiAl3 formed like sheet and layer. The shearing fracture of joints occurred on the interface of Al and diffusion zone or in the Al-based metal.

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姚為 吳愛萍 鄒貴生 任家烈. Ti／Al擴(kuò)散焊的接頭組織結(jié)構(gòu)及其形成規(guī)律[J].稀有金屬材料與工程,2007,36(4):700~704.[Yao Wei, Wu Aiping, Zou Guisheng, Ren Jialie. Structure and Forming Process of the Ti/Al Diffusion Bonding Joints[J]. Rare Metal Materials and Engineering,2007,36(4):700~704.]
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  • 最后修改日期:2006-08-18
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