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元素添加方式對Ti-6Al-3Nb-2Zr-1Mo合金性能的影響
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Influence of Element Addition Ways on the Performance of Ti-6Al-3Nb-2Zr-1Mo Alloy
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    摘要:

    通過研究元素添加方式對粉末冶金Ti-6Al-3Nb-2Zr-1Mo(Ti80)合金微觀組織和力學(xué)性能的影響，探索了提高粉末冶金Ti80合金材料性能的途徑和方法。結(jié)果表明：要得到相對密度大于97%的粉末冶金燒結(jié)坯，Al必須以NbAl、ZrAl、MoAl、MoAlTi等中間合金方式進(jìn)行添加；Nb、Zr可以單質(zhì)或中間合金方式添加；Mo需要以MoAl或MoAlTi中間合金方式添加。Ti不能完全以TiH2的方式添加；當(dāng)Ti以純Ti粉方式添加時(shí)，拉伸斷口沒有裂紋產(chǎn)生；當(dāng)Ti以TiH2方式添加時(shí)，斷口有顯著的裂紋產(chǎn)生；H是裂紋產(chǎn)生的主要原因。當(dāng)元素以合適的方式添加時(shí)，Ti80合金燒結(jié)件的性能可達(dá)到：σb=890~1020 MPa，σ0.1=755~875 MPa，σ0.2=785~895 MPa，δ5=5.5%~9.0%，ψ=11%~20%，與鍛態(tài)性能相比，強(qiáng)度性能有顯著提高，而塑性降低。

    Abstract:

    The influence of element addition ways on the microstructure and the performance of P/M Ti-6Al-3Nb-2Zr-1Mo alloy (Ti80) was investigated in order to improve the processing properties. The results indicate that Al must be added by NbAl, ZrAl, MoAl or MoAlTi pre-alloy to obtain the relative density above 97%; Nb and Zr can be added by elementary substance or pre-alloy; Mo should be added by MoAl or MoTiAl pre-alloy. Ti can not completely added by TiH2 powder. The tensile fracture of P/M Ti80 alloy exhibits outstretch rupture and has no crack when Ti is added by Ti powder while the tensile fracture shows brittle rupture and has distinct cracks when Ti is added by TiH2 powder. Hydrogen is the main reason causing cracks of the alloy. Adopting appropriate element addition ways, good performance of the P/M Ti80 alloy can be obtained, such as σb=890-1020 MPa, σ0.1=755-875 MPa, σ0.2=785-895 MPa, δ5=5.5%-9.0%, and ψ=11%-20%. Compared with the forged alloy, the sintered alloy has much higher intensity and lower plasticity.

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黃 瑜,湯慧萍,賈文鵬,劉海燕,賀衛(wèi)衛(wèi).元素添加方式對Ti-6Al-3Nb-2Zr-1Mo合金性能的影響[J].稀有金屬材料與工程,2011,40(12):2227~2231.[Huang Yu, Tang Huiping, Jia Wenpeng, Liu Haiyan, He Weiwei. Influence of Element Addition Ways on the Performance of Ti-6Al-3Nb-2Zr-1Mo Alloy[J]. Rare Metal Materials and Engineering,2011,40(12):2227~2231.]
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  • 收稿日期:2010-12-06
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