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首页> 外文期刊>Materials Science and Engineering >Microstructural, mechanical and fractographical study of titanium-CP and Ti-6Al-4V similar brazing with Ti-based filler
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Microstructural, mechanical and fractographical study of titanium-CP and Ti-6Al-4V similar brazing with Ti-based filler

机译：钛-CP和Ti-6Al-4V与钛基填料的类似钎焊的显微组织，力学和分形学研究

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摘要

Commercial pure titanium (Ti-CP) and Ti-6Al-4V alloy were brazed in a controlled atmosphere furnace, each of them to itself, using an amorphous STEMET 1228 (Ti-27Zr-14Cu-13Ni, wt%) brazing foil. Primarily, quality of the brazed joints was evaluated by an ultrasonic test and then effect of temperature and time were investigated on joint microstructure and mechanical properties. The former by metallography, scanning electron microscope (SEM) and X-ray diffraction (XRD) analyses and the latter by microhardness and shear test. Original microstructure of the Ti-CP and the Ti-6Al-4V base metals were not altered using this braze alloy. The joints mainly consist of γ-Cu/Ni [Ti(Zr)]_2 and λ-Lave (Cu/Ni)_2[Ti,(Zr)] intermetallic compounds. Prolonging brazing time, results in replacement of these brittle phases with a fine acicular Widmanstatten structure dominating the entire joint due to redistribution of Cu and Ni from the braze alloy into the base metals. Optimum shear strength of the Ti-CP and the Ti~6Al-4V brazed joints were achieved 261.7 and 571 MPa, respectively. The best parameters for shear strength were obtained at 870 ℃-30 min in case of the Ti-CP and 950 ℃-30 min in case of the Ti-6Al-4V. Using Ti-26.8Zr-13.9Cu-13Ni amorphous filler alloy permits furnace brazing at a temperature lower than that of α ⇒ β transformation. From practical point of view, it was found that controlled atmosphere brazing of compatible samples have located in a simple close chamber, maybe carried out as an effective and economic process.
机译：使用无定形STEMET 1228（Ti-27Zr-14Cu-13Ni，wt％）钎焊箔，在可控气氛炉中将商用纯钛（Ti-CP）和Ti-6Al-4V合金钎焊到其自身。首先，通过超声测试评估钎焊接头的质量，然后研究温度和时间对接头显微组织和力学性能的影响。前者通过金相，扫描电子显微镜（SEM）和X射线衍射（XRD）分析，而后者通过显微硬度和剪切试验。使用该钎焊合金不会改变Ti-CP和Ti-6Al-4V贱金属的原始微观结构。接头主要由γ-Cu/ Ni [Ti（Zr）] _ 2和λ-Lave（Cu / Ni）_2 [Ti，（Zr）]金属间化合物组成。延长钎焊时间，由于铜和镍从钎焊合金中重新分布到贱金属中，导致细化的针状维氏合金结构取代了这些脆性相，从而主导了整个接头。 Ti-CP和Ti〜6Al-4V钎焊接头的最佳剪切强度分别达到261.7 MPa和571 MPa。 Ti-CP的最佳剪切强度参数是在870℃-30分钟，Ti-6Al-4V的最佳剪切强度是在950℃-30分钟。使用Ti-26.8Zr-13.9Cu-13Ni非晶态合金可允许在低于α⇒β相变的温度下进行炉中钎焊。从实践的角度来看，发现兼容样品的受控气氛钎焊位于简单的密闭室中，这可能是一种有效且经济的过程。

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