| Preparation of semi-solid billet of magnesium alloy and its thixoforming |
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| 作者姓名： | 姜巨福 罗守靖 |
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| 作者单位： | School of Materials Science and Engineering Harbin Institute of Technology，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，Harbin 150001，China |
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| 摘 要： | Preparation of semi-solid billet of magnesium alloy and thixoforming was investigated by applying equal channel angularextrusion to magnesium alloy.The results show that mechanical properties of AZ91D alloy at room temperature,such as yieldstrength(YS),ultimate tensile strength(UTS)and elongation,are enhanced greatly by four-pass equal channel angularextrusion(ECAE)at 573 K and microstructure of AZ91D alloy is refined to the average grain size of 20μm.Through using ECAE asstrain induced step in SIMA and completing melt activated step by semi-solid isothermal treatment,semi-solid billet with finespheroidal grains of 25μm can be prepared successfully.Compared with common SIMA,thixoformed satellite angle framecomponents using semi-solid billet prepared by new SIMA have higher mechanical properties at room temperature and hightemperature of 373 K.
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| 关 键 词： | 镁合金 触变性 型坯 机械性能 微观结构 |
| 收稿时间： | 2006-03-27 |
| 修稿时间： | 2006-06-10 |
Preparation of semi-solid billet of magnesium alloy and its thixoforming |
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| JIANG Ju-fu,LUO Shou-jing.Preparation of semi-solid billet of magnesium alloy and its thixoforming[J].Transactions of Nonferrous Metals Society of China,2007,17(1):46-50. |
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| Authors: | JIANG Ju-fu LUO Shou-jing |
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| Affiliation: | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Preparation of semi-solid billet of magnesium alloy and thixoforming was investigated by applying equal channel angular extrusion to magnesium alloy. The results show that mechanical properties of AZ91D alloy at room temperature, such as yield strength(YS), ultimate tensile strength(UTS) and elongation, are enhanced greatly by four-pass equal channel angular extrusion(ECAE) at 573 K and microstructure of AZ91D alloy is refined to the average grain size of 20 βm. Through using ECAE as strain induced step in SIMA and completing melt activated step by semi-solid isothermal treatment, semi-solid billet with fine spheroidal grains of 25 βm can be prepared successfully. Compared with common SIMA, thixoformed satellite angle frame components using semi-solid billet prepared by new SIMA have higher mechanical properties at room temperature and high temperature of 373 K. |
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| Keywords: | magnesium alloy thixoforming equal channel angular extrusion(ECAE) semi-solid billet mechanical properties |
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