The influence of spark plasma sintering temperatures on the microstructure, hardness, and elastic modulus of the nanocrystalline Al-xV alloys produced by high-energy ball milling
The influence of spark plasma sintering temperatures on the microstructure, hardness, and elastic modulus of the nanocrystalline Al-xV alloys produced by high-energy ball milling
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DOI：
10.1016/j.jmst.2022.02.008
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
J. Christudasjustus;C. S. Witharamage;G. Walunj;T. Borkar;R.K. Gupta
中科院分区：
文献类型：
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作者：
J. Christudasjustus;C. S. Witharamage;G. Walunj;T. Borkar;R.K. Gupta
Al-xV合金（x= 2原子%，5原子%，10原子%）采用高能球磨法制备了具有纳米晶结构和高固溶度的V粉末。通过采用200至400 °C的宽温度范围的放电等离子体烧结（SPS）来固结合金粉末。利用X射线衍射分析、扫描电镜和透射电镜研究了V在Al中的固溶度和显微组织。SPS烧结温度和V含量对合金的显微组织有影响。在所有SPS温度下，合金均表现出较高的V固溶度，比平衡态高6个数量级，晶粒尺寸< 50 nm。在400 °C下检测到Al 3V金属间化合物的形成。在SPS过程中观察到贫V相和双峰晶粒尺寸的形成，其随SPS温度的升高而增加。使用纳米压痕测量的硬度和弹性模量显著高于商业合金。例如，在200 °C下通过SPS制备的Al-V合金表现出沿着的5.21 GPa的硬度和96.21 GPa的弹性模量。讨论了显微组织和硬度随SPS温度的变化规律。
Al-xV alloys (x= 2 at.%, 5 at.%, 10 at.%) with nanocrystalline structure and high solid solubility of V were produced in powder form by high-energy ball milling (HEBM). The alloy powders were consolidated by spark plasma sintering (SPS) employing a wide range of temperatures ranging from 200 to 400 °C. The microstructure and solid solubility of V in Al were investigated using X-ray diffraction analysis, scanning electron microscope and transmission electron microscope. The microstructure was influenced by the SPS temperature and V content of the alloy. The alloys exhibited high solid solubility of V―six orders of magnitude higher than that in equilibrium state and grain size < 50 nm at all the SPS temperatures. The formation of Al3V intermetallic was detected at 400 °C. Formation of a V-lean phase and bimodal grain size was observed during SPS, which increased with the increase in SPS temperature. The hardness and elastic modulus, measured using nanoindentation, were significantly higher than commercial alloys. For example, Al-V alloy produced by SPS at 200 °C exhibited a hardness of 5.21 GPa along with elastic modulus of 96.21 GPa. The evolution of the microstructure and hardness with SPS temperatures has been discussed.