粉末冶金法制備AZ91鎂合金的組織及熱性能

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基金項目:

北京科技大學422人才計劃資助項目(No.200504)

教育部新世紀人才計劃資助項目(No.NCET-05-0104)

Microstructure and thermal property of AZ91 magnesium alloy prepared by powder metallurgy

1. State Key Laboratory for Advanced Metal and Materials, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘要: 采用粉末冶金方法制備了AZ91鎂合金,研究了燒結溫度對合金的致密度和熱導率的影響規律,并對燒結樣品的物相和顯微組織進行了分析.研究發現,AZ91鎂合金的最佳燒結溫度為610℃,致密度可以達到97.4%,實驗條件下所獲得的最高熱導率可達到63.1W·m^-1·K^-1.X射線衍射和掃描電子顯微鏡結果分析表明,燒結合金組織主要由α-Mg固溶體和β-Mg₁₇Al₁₂相兩相組成,其中β-Mg₁₇Al₁₂相表現出離異共晶β相和非連續析出β相兩種主要存在形態.
- AZ91鎂合金 /
- 粉末冶金 /
- 微觀組織 /
- 熱性能
Abstract: AZ91 magnesium alloy was fabricated by powder metallurgy. The effects of sintering temperature on the relative density and thermal conductivity were investigated. The microstructure of the material was observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result shows that the best sintering temperature is 610 12. At this sintering temperature the relative density can reach 97.4% and the highest thermal conductivity can be up to 63.1 W·m^-1·K^-1. The sintering microstructure of the alloy is composed of α-Mg solid solution matrix and β-Mg₁₇Al₁₂. The β phase exhibits two main forms, i.e., divorced eutectic 13 phase and discontinuous precipitated β phase.
- AZ91 magnesium alloy /
- powder metallurgy /
- microstructure /
- thermal property