(1. 華東交通大學(xué) 載運(yùn)工具與裝備教育部重點(diǎn)實(shí)驗(yàn)室，南昌 330013;
2．南昌大學(xué) 機(jī)電工程學(xué)院，南昌 330031)
摘 要: 對鎂基復(fù)合材料半固態(tài)充型凝固過程進(jìn)行數(shù)值模擬，并進(jìn)行半固態(tài)流變成形實(shí)驗(yàn)。結(jié)果表明，在液態(tài)充型過程中，壓力變化非常紊亂；而在固態(tài)充型過程中，壓力在推進(jìn)方向上逐漸降低，這將產(chǎn)生有利于充型的背壓。凝固過程的固相體積分?jǐn)?shù)變化表明：在半固態(tài)充型條件下，整個(gè)鑄件基本上是同時(shí)凝固，從而可有效地避免在液態(tài)充型時(shí)產(chǎn)生縮孔縮松。實(shí)驗(yàn)結(jié)果與模擬結(jié)果吻合,半固態(tài)流變成形件的質(zhì)量優(yōu)于液態(tài)成形件的質(zhì)量。
關(guān)鍵字: 鎂基復(fù)合材料；半固態(tài)，復(fù)合材料，數(shù)值模擬
magnesium matrix composite
（1.Key Laboratory of Ministry of Education for Conveyance and Equipment,
East China Jiaotong University, Nanchang 330013, China;
2. School of Mechanical-Electrical Engineering, Nanchang University, Nanchang 330031, China）
Abstract:The semi-solid filling and solidification process of magnesium composite was simulated and the semi-sold filling experiment was carried out. The results indicate that the distribution of pressure during the liquid filling process is inordinate, but the pressure reduces gradually in the filling direction during the semi-solid filling process, which is favorable to generate back pressure during filling process. According to the distribution of the solid volume fraction during the solidification, it is found that the casting solidifies at the same time during the semi-solid filling, which can reduce shrinkage cavity and porosity. And the simulation results are in accordance with the experimental results. The quality of semi-solid reho-forming casting is better than that of liquid forming casting.
Key words: Mg matrix composite; semi-solid; composite; numerical simulation
