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首页> 外文期刊>Journal of Materials Engineering and Performance >Vacuum Pressureless Sintering of Ti-6Al-4V Alloy with Full Densification and Forged-Like Mechanical Properties
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Vacuum Pressureless Sintering of Ti-6Al-4V Alloy with Full Densification and Forged-Like Mechanical Properties

机译：真空无压烧结Ti-6Al-4V合金，具有全致密化和伪造的机械性能

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摘要

Ti-6Al-4V ingots with a nearly 100% density, fine and homogeneous basket-weave microstructure, and better comprehensive mechanical properties (UTS = 935 MPa, Y.S. = 865 MPa, El. = 15.8%), have been manufactured by vacuum pressureless sintering of blended elemental powders. Coarse TiH2 powder, Al powder (2, 20 mu m), V powder, and Al-V master alloy powder were used as raw materials to produce different powder mixtures (D (50) = 10 mu m). Then, the compacts made by cold isostatic pressing were consolidated by different sintering curves. A detailed investigation of different as-sintered samples revealed that a higher density can be obtained by generating transient molten Al in the sintering process. Coarse Al powder and a rapid heating rate under the melting point of Al contribute to molten Al formation. The presence of temporary liquid phase changes the sintering mechanism, accelerating the sintering neck formation, improving sinterability of the powder mixtures. Density of 99.5% was achieved at 1150 A degrees C, which is markedly lower than the sintering temperatures reported for conventional blended elemental powder metallurgy routes. In addition, low interstitial content, especially for oxygen (0.17 wt.%), is obtained by strict process control.
机译：Ti-6Al-4V锭，具有近100％的密度，精细和均匀的篮子编织微观结构，更好的综合机械性能（UTS = 935MPa，Ys = 865MPa，EL. = 15.8％），已经通过真空无线制造制造混合元素粉末的烧结。粗TiH2粉末，Al粉末（2,20μm），V粉末和Al-V主合金粉末作为原料以产生不同的粉末混合物（D（50）=10μm）。然后，通过不同的烧结曲线固结冷等静压制成的压块。对不同的烧结样品的详细研究表明，通过在烧结过程中产生瞬态熔融Al，可以获得更高的密度。粗铝粉和Al熔点下的快速加热速率有助于熔融Al形成。临时液相的存在改变了烧结机构，加速烧结颈部形成，改善粉末混合物的烧结性。在1150℃下实现99.5％的密度，显着低于常规混合元素粉末冶金途径报道的烧结温度。此外，通过严格的过程控制获得低间质含量，特别是对于氧气（0.17重量％）。

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