【摘要】：采用氣泡攪拌法制備AZ91D鎂合金半固態(tài)漿料,研究工藝參數(shù)變化,包括氣體流量、冷卻速率和攪拌結(jié)束溫度,對AZ91D鎂合金半固態(tài)漿料顯微組織的影響規(guī)律。結(jié)果表明:隨著氣體流量從0升高至5L/min,α-Mg初生相平均顆粒尺寸從119.1μm降至77.2μm,而平均形狀因子從0.1升高至0.596,氣泡攪拌中非枝晶初生相來自于枝晶破碎和熔體形核;隨著冷卻速率從3.6℃/min升高至14.6℃/min,α-Mg初生相平均顆粒尺寸從105.0μm降至68.1μm,而平均形狀因子在冷卻速率為9.1℃/min時達到最高,過高或過低的冷卻速率都會導(dǎo)致初生相的枝晶生長;攪拌結(jié)束溫度從590℃升至595℃對最終的AZ91D鎂合金半固態(tài)漿料顯微組織無明顯影響,這是因為半固態(tài)漿料中已經(jīng)形成了足夠數(shù)量的初生相。
[Abstract]:The semi-solid slurry of AZ91D magnesium alloy was prepared by bubble stirring method. The influence of technological parameters, including gas flow rate, cooling rate and stirring end temperature, on microstructure of semi-solid slurry of AZ91D magnesium alloy was studied. The results show that with the increase of gas flow rate from 0 to 5L / min, the average particle size of 偽-Mg primary phase decreases from 119.1 渭 m to 77.2 渭 m, while the average shape factor increases from 0. 1 to 0. 596. The primary phase of non-dendritic crystal is formed from dendritic breakup and melt nucleation. With the increase of cooling rate from 3.6 鈩，

本文編號：2413035