Effect of different processes on hydrogen storage properties of AZ magnesium alloy
碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === In this research, AZ31 and AZ91 magnesium alloys were used as hydrogen storage materials to compare the effects of equal channel angular pressing (ECAP) and high energy ball milling (HEBM) processes on the hydrogen storage properties of AZ magnesium alloys. In a...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2017
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| Online Access: | http://ndltd.ncl.edu.tw/handle/63ypq5 |
| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === In this research, AZ31 and AZ91 magnesium alloys were used as hydrogen storage materials to compare the effects of equal channel angular pressing (ECAP) and high energy ball milling (HEBM) processes on the hydrogen storage properties of AZ magnesium alloys. In addition, the effects of using different AZ magnesium alloys (AZ31 and AZ91) with the same processes and parameters on the hydrogen storage properties was investigated.
The results show that the crystal size of AZ magnesium alloy has been decreased by both ECAP and HEBM processes. It was also revealed that AZ31 magnesium alloy processed by ECAP route BC with 8 passes has faster absorption and desorption rate than AZ31 magnesium alloy processed by HEBM ball material ratio 30:1 with 300rpm. The capacity of two samples are 7.0 and 6.8 wt.%. The AZ91 magnesium alloy processed by HEBM ball material ratio 30:1 with 300rpm has faster hydrogen absorption and desorption rate than that of AZ91 magnesium alloy processed by ECAP route BC with 8 passes. The capacity of two samples are both 6.7 wt.%. Furthermore, hydrogen absorption rate and storage capacity of AZ magnesium alloy at three different temperatures (375°C, 350°C and 325°C) was studied and there was increasing of performance for increasing temperature. It was also investigated that the material with higher aluminum content has lower activation energy.
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