【摘要】 根据传热学原理和计算机辅助热分析(CATA)技术为理论基础,通过试验方法研究了镁合金AM60半固态成形性,研究结果表明,AM60合金固相率对温度的变化极为敏感,当初始固相分数从20%过渡到30%,温度从618.0℃降至615.4℃,仅仅约降低了2.6℃。在此区间内,固相率对温度的平均变化为3.85%/℃,初始固相率波动幅度为12.8%-19.2%/℃;当初始固相分数从30%过渡到40%,温度从615.4℃降至612.2℃,也仅有3.2℃左右,在此区间内,固相率对温度的平均变化为3.125%/℃,初始固相率波动幅度为7.8%-10.4%/℃;当温度在577.9-589.9℃区间内(跨度约为12℃),由于AM60镁合金固相分数则始终维持在62%上下。因此,AM60镁合金半固态成形工艺中,其初始固相率不应选择通常的20%-40%的区间范围内,而应该选择较大值,最佳值为62%左右。更多还原

【Abstract】 In the present work,based on heat transfer theory and CATA technology,a research on formability of semi-solid magnesium alloy AM60 was implemented through an experiment which achieved the quantitative relationship between the semisolid solid-phase rate and temperature.It is shown that the solid-phase rate of AM60 alloys is extremely sensitive to its temperature.About only 2.6℃ decreases when the solid-phase rate of the alloys is changed from 20% to 30%,and the average change rate of solid rate to temperature is 3.85%/℃,initial solid rate fluctuations from 12.8% to 19.2%/℃;About 3.2℃ decrease when the solid-phase rate of the alloy changed from 30% to 40%,and the average change rate of solid rate to temperature is 3.125%/℃,initial solid rate fluctuations from 7.8% to 10.4%/℃;While the temperature range from 577.9℃ to 589.9℃,which span 12 ℃,solid rate is always maintained at around 62%?The result indicates that the initial solid rate should be higher,best is 62% rather than the usual 20% to 40% according to the AM60 magnesium alloy.更多还原