前驅體浸漬法制備泡沫鎳屈服強度與孔結構的關系
發(fā)布時間:2018-03-08 07:01
本文選題:泡沫鎳 切入點:有限元模擬 出處:《粉末冶金材料科學與工程》2017年04期 論文類型:期刊論文
【摘要】:采用有限元模擬技術計算不同孔結構泡沫鎳的屈服強度,并以氣霧化Ni-20Cr合金粉末為原料,以不同孔徑的聚氨酯泡沫為模板,控制浸漬工藝制備出不同孔徑與不同密度的泡沫鎳鉻合金,研究合金屈服強度隨密度與孔徑尺寸的變化關系。有限元模擬計算結果表明,開孔泡沫金屬材料的屈服強度符合Gibson-Ashby方程,在開孔泡沫金屬材料密度一定的情況下,材料的屈服強度不隨孔徑的變化而變化。實驗結果表明,對于相同孔徑的泡沫金屬材料,其屈服強度和相對密度的關系為σ/σs與相對密對(即ρ/ρs)的1.5次方呈線性關系(σ和σs分別為泡沫材料與致密材料的屈服強度;ρ和ρs分別為泡沫材料與致密材料的密度);而具有相同密度和不同孔徑的泡沫鎳鉻合金,其屈服強度很接近,驗證了開孔泡沫金屬材料屈服強度隨密度的變化規(guī)律符合Gibson-Ashby方程。
[Abstract]:The yield strength of nickel foam with different pore structures was calculated by finite element simulation technique. The polyurethane foam with different pore sizes was used as the template, and the gas-atomized Ni-20Cr alloy powder was used as the raw material. Foam Ni-Cr alloy with different pore sizes and different densities was prepared by controlling impregnation process. The relationship between yield strength and pore size was studied. The finite element simulation results show that the yield strength of the alloy varies with the pore size. The yield strength of porous metal foam materials conforms to the Gibson-Ashby equation. When the density of porous metal foams is constant, the yield strength of the materials does not change with the pore size. The experimental results show that the yield strength of foam metal materials with the same pore size is similar to that of foamed metal materials with the same pore size. The relationship between yield strength and relative density is linear between 蟽 / 蟽 s and relative density pair (蟻 / 蟻 s) (蟽 and 蟽 s are respectively the yield strength of foam material and dense material, 蟻 and 蟻 s are density of foam material and dense material, respectively. A foamed Ni-Cr alloy with the same density and different pore sizes, The yield strength of the porous metal foams is very close, which verifies that the variation of the yield strength with the density accords with the Gibson-Ashby equation.
【作者單位】: 西北有色金屬研究院金屬多孔材料國家重點實驗室;西安賽隆金屬材料有限責任公司;西安交通大學機械結構強度與振動國家重點實驗室;
【基金】:國家高技術研究發(fā)展計劃(863計劃)資助項目(2015AA034304) 陜西省科技新星項目(2015KJXX78)
【分類號】:TB383.4;TG146.15
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