紅外線硬銲接合TiAl/Ti3Al介金屬與Ti-6Al-4V合金之研究

The Study of Infrared Brazing TiAl/Ti3Al Intermetallics and Ti-6Al-4V Alloy

陳耀堂(Yao-Tang Chen)

指導教授 ： 吳錫侃

共同指導教授 ： 薛人愷(Ran-Kae Shiue)

國立臺灣大學/工學院/材料科學與工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.00398

摘要

本研究以三種鈦基填料利用紅外線硬銲接合γ-TiAl/Ti-6Al-4V與α2-Ti3Al/ Ti-6Al-4V兩組試片。以60Ti-15Cu-25Ni或70Ti-15Cu-15Ni為硬銲填料時，γ-TiAl/Ti-6Al-4V試片於銲道區域之顯微組織相當類似，靠近γ-TiAl基材端都會析出連續α2-Ti3Al層與灰白相間層，而銲道中央之殘留填料區域主要是由Ti2Ni或Ti2Cu相所構成；殘留填料區域可藉由硬銲溫度的提高或持溫時間的增加而消除，但連續α2-Ti3Al層與灰白相間層之厚度不會隨接合條件的改變而改變；當銲道區域仍有殘留填料存在時，裂痕會由Ti2Ni相起始並擴展至整個試片斷裂，若殘留填料完全消除，此時裂痕由連續α2-Ti3Al層起始並擴展；至於α2-Ti3Al/ Ti-6Al-4V與γ-TiAl/Ti-6Al-4V相異之處在於前者無連續α2-Ti3Al層與灰白相間層的析出，而前者之剪力強度最高可達373MPa，後者最高可達280MPa。以40Ti-20Zr-20Cu-20Ni為硬銲填料時，由於Zr原子的加入，使接合試片之銲道區域複雜許多。γ-TiAl/Ti-6Al-4V試片於靠近γ-TiAl基材端仍有連續α2-Ti3Al層與灰白相間層析出，且殘留填料區域由三種相構成；而α2-Ti3Al/ Ti-6Al-4V試片除了無連續α2-Ti3Al層與灰白相間層析出之外，殘留填料區之組成相與γ-TiAl/Ti-6Al-4V試片相似。因為Zr原子較不易擴散，使殘留填料無法在短時間內完全消除，因此使用40Ti-20Zr-20Cu-20Ni填料時，裂痕之起始與擴展都是在殘留填料區域發生，而最高之剪力強度可達390MPa。

關鍵字

紅外線硬銲接合 ； γ-TiAl ； α2-Ti3Al ； Ti-6Al-4V ； 鈦基填料 ； 顯微組織 ； 剪力強度

並列摘要

Infrared vacuum brazing γ-TiAl/Ti-6Al-4V and α2-Ti3Al/ Ti-6Al-4V two kinds of samples using three Ti-based fillers: 60Ti-15Cu-25Ni, 70Ti-15Cu-15Ni and 40Ti-20Zr-20Cu-20Ni. For 60Ti-15Cu-25Ni and 70Ti-15Cu-15Ni fillers to braze γ-TiAl and Ti-6Al-4V, their brazed zone microstructures are quite similar. Next to γ-TiAl base metal, two layers are formed: one is composed of α2-Ti3Al+γ-TiAl lamellar mixtures and the other is a continuous α2-Ti3Al layer. The residual filler in the brazed zone is composed of Ti2Ni and Ti2Cu in which the decrement of residual filler can be achieved by increasing the brazing time and/or temperature. However, the thicknesses of the continuous α2-Ti3Al layer and α2-Ti3Al+γ-TiAl lamellar do not change by using different brazing conditions. When the residual filler is still existence, the crack will form in it and propagate until the sample failure. If the residual filler is already eliminated, the crack will form in the continuous γ-TiAl layer. For α2-Ti3Al/ Ti-6Al-4V sample, as compared to γ-TiAl/Ti-6Al-4V sample, there is no α2-Ti3Al+γ-TiAl lamellar and no a continuous α2-Ti3Al layer. When using 40Ti-20Zr-20Cu-20Ni filler, the brazed zone becomes more complicated. The most distinctive point is the residual filler can be composed of three intermetallics. The crack is also formed in the residual filler and then propagate until the sample failure. Because the Zr atoms are difficult to diffuse directly into two base metals, no matter how high of brazing temperature and how long of brazing time, the residual filler will not disappear. However, shear stress in this case can reach about 390MPa.

並列關鍵字

Infrared brazing ； γ-TiAl ； α2-Ti3Al ； Ti-6Al-4V ； Ti-based fillers ； microstructure ； shear stress

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