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首页> 外文期刊>Transactions of Nonferrous Metals Society of China >Microstructure and mechanical properties of magnesium alloy prepared by lost foam casting
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Microstructure and mechanical properties of magnesium alloy prepared by lost foam casting

机译：消失模铸造镁合金的组织和力学性能

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摘要

The microstructure and mechanical properties of AZ91 alloy prepared by lost foam casting (LFC) and various heat treatments have been investigated. The microstructure of the AZ91 alloy via LFC consists of dominant alpha-Mg and beta-Mg_(17)Al_(12) as well as a new phase A1_(32)Mn_(25) with size of about 5-50 mum, which has not been detected in AZ91 alloy prepared by other casting processes. The tests demonstrate that the as-cast mechanical properties are higher than those of sand gravity casting because of chilling and cushioning effect of foam pattern during the mould filling. The solution kinetics and the aging processes at different temperatures were also investigated by hardness and electrical resistivity measurements. The kinetics of aging are faster at the high temperature due to enhanced diffusion of atoms in the matrix, so the hardness peak at 380 deg C occurs after 10 h; while at the lower aging temperature (150 deg C) , the peak is not reached in the time(24 h) considered.
机译：研究了通过消失模铸造（LFC）和各种热处理制备的AZ91合金的组织和力学性能。通过LFC的AZ91合金的微观结构由主要的α-Mg和β-Mg_（17）Al_（12）以及尺寸约为5-50微米的新相A1_（32）Mn_（25）组成其他铸造工艺制备的AZ91合金中未检测到。测试表明，铸模的机械性能高于砂重力铸造的机械性能，这是由于模具填充过程中泡沫型的冷却和缓冲作用所致。还通过硬度和电阻率测量研究了在不同温度下的溶液动力学和老化过程。由于原子在基体中的扩散增强，因此在高温下老化的动力学更快，因此在10小时后380℃出现了硬度峰值。在较低的老化温度（150摄氏度）下，在考虑的时间（24小时）内未达到峰值。

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