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Mg-Al-Zn系鎂合金在大氣中的散熱性能研究
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西南交通大學(xué)材料科學(xué)與工程學(xué)院;材料先進技術(shù)教育部重點實驗室,西南交通大學(xué)材料科學(xué)與工程學(xué)院;材料先進技術(shù)教育部重點實驗室,西南交通大學(xué)材料科學(xué)與工程學(xué)院;材料先進技術(shù)教育部重點實驗室,西南交通大學(xué)材料科學(xué)與工程學(xué)院;材料先進技術(shù)教育部重點實驗室

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國家自然科學(xué)基金青年項目(No. 51401172),四川省科技計劃(No. 2015HH0012),中央高?；究蒲袠I(yè)務(wù)費專項資金(No. 2682014BR002)


Atmospheric Heat Dispersion Research of Mg-Al-Zn Magnesium Alloys
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School of Material Science and Engineering,Southwest Jiaotong University,Chengdu,School of Material Science and Engineering,Southwest Jiaotong University,Chengdu,School of Material Science and Engineering,Southwest Jiaotong University,Chengdu,School of Material Science and Engineering,Southwest Jiaotong University,Chengdu,;China;Key Laboratory for Advanced Technologies of Materials,Ministry of Education,Chengdu,;China

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    摘要:

    在20~220℃范圍內(nèi)對比研究了AZ80、AZ31、ZK60鎂合金和AA6082鋁合金在大氣中的散熱性能，分別測量其環(huán)境散熱曲線并用指數(shù)型熱動力學(xué)方程T=T0+ΔT0·exp（-t/A0）擬合。結(jié)果表明，固溶處理可使鑄態(tài)或擠壓態(tài)鎂合金熱導(dǎo)率下降，而固溶+時效處理后其熱導(dǎo)率有所提升。分析了瞬時溫差與瞬時溫度比值ΔT/T與鎂合金、鋁合金散熱性能的關(guān)系，自然對流條件下，柱高對AZ80鎂合金散熱性能影響較小；在人工強制對流條件下，當(dāng)0.25<ΔT/T<0.45時，高柱（60mm）散熱速率約為低柱（20mm）的兩倍。在自然對流條件下，AZ80、AZ31鎂合金的散熱性能在0.25<ΔT/T<0.45（120~220℃）時，明顯優(yōu)于AA6082鋁合金。在0.05<ΔT/T<0.25（20~120℃）時，這三種合金的散熱性能無明顯差別。

    Abstract:

    The atmospheric heat dispersion of magnesium alloys AZ80、AZ31、ZK60 and aluminum alloys AA6082 were measured. It was apparently that the thermal dispersion curves of the columnar model can be exponential fitted as T=T0+ΔT0·exp(-t/A0). The result shows that the solution treatment can make the thermal conductivity of the magnesium alloys decrease. However, the solutionizing plus aging treatment can make the thermal conductivity increase. The relationship between ΔT/T and the heat dispersion rate was also studied. The heat dispersion rate of high columns (60mm) is about two times that of low columns (20mm) in the condition of forced air convection, while there is no obvious difference in the condition of natural convection. Moreover, the dispersion properties of these alloys can be evidently dived into two regions by ΔT/T in natural convection. There was no much difference among AZ80、AZ31、AA6082 alloys when 0.05<ΔT/T<0.25 (20~120℃), while the AZ80 and AZ31 exhibited more preferential performance than AA6082 alloys when 0.25<ΔT/T<0.45 (120~220℃).

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任凌寶,權(quán)高峰,江柱中,尹冬弟. Mg-Al-Zn系鎂合金在大氣中的散熱性能研究[J].稀有金屬材料與工程,2017,46(5):1265~1270.[Ren Lingbao, Quan Gaofeng, Jiang Zhuzhong, Yin Dongdi. Atmospheric Heat Dispersion Research of Mg-Al-Zn Magnesium Alloys[J]. Rare Metal Materials and Engineering,2017,46(5):1265~1270.]
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  • 收稿日期:2016-01-06
  • 最后修改日期:2016-03-21
  • 錄用日期:2016-03-30
  • 在線發(fā)布日期: 2017-09-27
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