Effect of microwave and conventional heating on sintering behavior and properties of Al-Mg-Si-Cu alloy
Effect of microwave and conventional heating on sintering behavior and properties of Al-Mg-Si-Cu alloy
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DOI：
10.1016/j.matchemphys.2011.07.008
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发表时间：
2011-10-17
影响因子：
4.6
通讯作者：
Agrawal, D.
中科院分区：
文献类型：
--
作者：
Padmavathi, C.;Upadhyaya, A.;Agrawal, D.
研究了加热方式和烧结温度对6711（Al-1 Mg-0.8Si-0.25Cu）合金烧结性能的影响。合金压块在常规和微波炉中在570、590、610和630 ℃下在真空（10（-6）℃）下固结。与传统烧结相比，微波与压坯相结合，并导致加工时间沿着减少58%，同时具有更高的加热速率。然而，快速加热速率导致组织不均匀，晶界处的熔体分数较大。XRD分析表明，由于扩散时间不足，没有金属间化合物。随着烧结温度的升高，所有压坯都经历了超固相线液相烧结（SLPS），相应地观察到更高的致密化和收缩。在两种模式下，电导率和硬度随烧结密度的变化趋势相似。在630 ℃下烧结的合金压坯在常规模式下导致机械性能的显著改善（TRS：57%上箭头; UTS：27%上箭头和延展性：41%上箭头）。T6状态下时效硬化处理的抗拉强度提高了136%，塑性急剧下降，相比烧结压坯。(C)2011爱思唯尔有限公司版权所有。
Effect of heating mode and sintering temperature on sinterability and properties of the 6711 (Al-1Mg-0.8Si-0.25Cu) alloy was investigated. Alloy compacts were consolidated in conventional and microwave furnace at 570, 590, 610 and 630 degrees C under vacuum (10(-6) torr). Microwaves coupled with the compacts and resulted in 58% reduction in processing time along with higher heating rates when compared to conventional sintering. However rapid heating rate resulted in inhomogeneous microstructure with larger melt fraction at grain boundaries. XRD analysis showed absence of intermetallics due to insufficient time for diffusion. With increasing sintering temperature, all compacts did undergo supersolidus liquid phase sintering (SLPS), accordingly higher densification and shrinkage was observed. The electrical conductivity and hardness followed similar trend as sintered density in both modes. Alloy compact sintered at 630 C resulted in significant improvement of mechanical properties (TRS: 57%up arrow; UTS: 27%up arrow and ductility: 41%up arrow) in conventional mode. Age hardening treatment under T6 temper enhanced the tensile strength by 136% with drastic reduction in ductility as compared with sintered compacts. (C) 2011 Elsevier B.V. All rights reserved.