王梓, 郭耸, 李晨晨, 张丹, 解立峰, 李斌. 爆炸烧结块体铝材力学性能受泄压孔影响研究[J]. 工程力学, 2022, 39(10): 238-248. DOI: 10.6052/j.issn.1000-4750.2021.06.0417
引用本文: 王梓, 郭耸, 李晨晨, 张丹, 解立峰, 李斌. 爆炸烧结块体铝材力学性能受泄压孔影响研究[J]. 工程力学, 2022, 39(10): 238-248. DOI: 10.6052/j.issn.1000-4750.2021.06.0417
WANG Zi, GUO Song, LI Chen-chen, ZHANG Dan, XIE Li-feng, LI Bin. EFFECT OF PRESSURE RELIEF HOLE DEPTH ON EXPLOSIVE CONSOLIDATION OF ALUMINUM POWDER[J]. Engineering Mechanics, 2022, 39(10): 238-248. DOI: 10.6052/j.issn.1000-4750.2021.06.0417
Citation: WANG Zi, GUO Song, LI Chen-chen, ZHANG Dan, XIE Li-feng, LI Bin. EFFECT OF PRESSURE RELIEF HOLE DEPTH ON EXPLOSIVE CONSOLIDATION OF ALUMINUM POWDER[J]. Engineering Mechanics, 2022, 39(10): 238-248. DOI: 10.6052/j.issn.1000-4750.2021.06.0417

爆炸烧结块体铝材力学性能受泄压孔影响研究

EFFECT OF PRESSURE RELIEF HOLE DEPTH ON EXPLOSIVE CONSOLIDATION OF ALUMINUM POWDER

  • 摘要: 采用爆炸烧结方法制备了力学性能良好的铝块。在泄压孔深度分别为10 mm、13 mm、16 mm的3组试验中,制得的铝块硬度相差较小,在HV146.88~HV155.14范围内;而在泄压孔深度为13 mm时,制得铝块硬度标准差最小,为HV6.89,是其他两组实验的50%左右;且此条件下制得的铝块抗压强度和弹性模量均为最大,分别为146.1 MPa和6.85 GPa;同时,此条件下制得铝块的密度也为最大(98.31%理论密度),且其标准差最小,为0.39%。经金相显微测试发现,泄压孔深度为10 mm和16 mm条件下制得样品表面有较长裂痕,这是由于,泄压孔深度不足时残留气体滞留于铝块样品内部,而泄压孔深度过大时底部铝粉冲入泄压孔造成样品局部松散。经定量对比评估,得出泄压孔深度为13 mm时制得铝块力学性能评分最高,为81.72分,表明该条件下制得的铝块力学性能最佳。

     

    Abstract: Aluminum materials with high mechanical properties were prepared by explosive consolidation, and the mechanical properties, phase and microstructure of aluminum materials were characterized and analyzed. In three groups of tests with different depths of relief hole of 10 mm, 13 mm and 16 mm, the hardness of the aluminum block is similar, which is within the range of HV146.88~HV155.14. When the relief hole is 13 mm deep, the hardness standard deviation of aluminum block is the smallest, which is HV6.89, i.e., about 50% of the other two groups. The compressive strength and elastic modulus of the aluminum block prepared with 13mm pressure relief hole depth are the largest, which are 146.1 MPa and 6.85 GPa respectively. Similarly, the density of aluminum block made under the condition of 13 mm pressure relief hole depth is the largest, which can reach 98.31% of the theoretical density of pure aluminum, with the smallest standard deviation among the three groups of tests, which is 0.39%. It was found by metallographic microscopic test that there were long cracks on the surface of the samples prepared under the conditions of h=10 mm and h=16 mm. The reason was that when the gas storage in the pressure relief hole was small, the gas would exist in the aluminum rod sample; while when the gas storage in the pressure relief hole was large, the aluminum powder at the bottom would be pushed into the pressure relief hole, causing partial looseness. Both will lead to the decrease of the mechanical properties of the aluminum rod. Finally, combined with the fuzzy mathematics comprehensive evaluation method and analytic hierarchy process, the fuzzy mathematics evaluation model of the influence factors of the block aluminum explosive sintering is constructed, and the mechanical properties of the aluminum block prepared with different pressure relief hole depths are quantitatively optimized. The results show that, the comprehensive scores of aluminum prepared by explosive sintering are 73.18, 81.72 and 76.98 respectively, which demonstrate that a pressure relief hole depth of 13 mm will lead to the best mechanical properties of bulk aluminum.

     

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