| Thixotropic behavior of semi-solid AZ91D magnesium alloy |
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| 作者姓名： | 毛卫民 甄子胜 闫时建 钟雪友 |
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| 作者单位： | SchoolofMaterialsScienceandEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，the National Advanced Materials Committee of China，国家自然科学基金 |
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| 摘 要： | The thixotropie behavior of semi-solid AZ91D slurry was studied through a Couette type viseometer.The results show that the apparent viscosity of semi-solid AZ91D magnesium alloy slurry increases after being isothermally held, but the apparent viscosity quickly falls down to a steady state value after being stirred again and it takes on a sharp shear-thinning behavior. With the same shearing rate and the rest time increasing, the steady apparent viscosity increases because of the agglomeration of the solid particles, and the time required for the slurry to reach the steady state also becomes longer. If the solid fraction increases, it takes longer time for the slurry to reach the steady apparent viscosity with the same shearing rate and the same rest time. If the solid fraction and the rest time are the same, but the shearing rate rises, it takes shorter time for the slurry to reach the steady apparent viscosity and the final steady apparent viscosity also decreases.
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| 关 键 词： | AZ91D合金 镁合金 触变铸造 半固态 表观粘度 |
Thixotropic behavior of semi-solid AZ91D magnesium alloy |
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| MAO Wei-min,ZHEN Zi-sheng,YAN Shi-jian,ZHONG Xue-you.Thixotropic behavior of semi-solid AZ91D magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2004,14(2):297-301. |
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| Authors: | MAO Wei-min ZHEN Zi-sheng YAN Shi-jian ZHONG Xue-you |
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| Abstract: | The thixotropic behavior of semi-solid AZ91D slurry was studied through a Couette type viscometer.The results show that the apparent viscosity of semi-solid AZ91D magnesium alloy slurry increases after being isothermally held, but the apparent viscosity quickly falls down to a steady state value after being stirred again and it takes on a sharp shear-thinning behavior. With the same shearing rate and the rest time increasing, the steady apparent viscosity increases because of the agglomeration of the solid particles, and the time required for the slurry to reach the steady state also becomes longer. If the solid fraction increases, it takes longer time for the slurry to reach the steady apparent viscosity with the same shearing rate and the same rest time. If the solid fraction and the rest time are the same, but the shearing rate rises, it takes shorter time for the slurry to reach the steady apparent viscosity and the final steady apparent viscosity also decreases. |
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| Keywords: | magnesium alloy AZ91D thixotropic behavior semi-solid apparent viscosity |
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