(湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082)
摘 要: 采用Deform-2D有限元軟件對(duì)噴射沉積7075/SiCp鋁基復(fù)合材料擠壓變形進(jìn)行數(shù)值模擬。模擬采用的擠壓變形條件為：擠壓比4~100，錠坯預(yù)熱溫度300~450 ℃，擠壓桿速度2~20 mm/s。結(jié)果表明：在擠壓變形區(qū)內(nèi)應(yīng)力及溫度變化劇烈，且在模子入口處均出現(xiàn)最大值；擠壓比和擠壓速度越大，應(yīng)力越大，溫度效應(yīng)也越顯著。噴射沉積7075/SiCp鋁基復(fù)合材料最佳擠壓條件為：錠坯預(yù)熱溫度350~400 ℃、擠壓比16~50、擠壓桿速度5~15 mm/s。數(shù)值模擬結(jié)果和工藝實(shí)驗(yàn)測(cè)量值吻合較好。
關(guān)鍵字: 7075Al/SiCp復(fù)合材料；噴射沉積；擠壓；剛塑性有限元；數(shù)值模擬
（College of Materials Science and Engineering, Hunan University,Changsha 410082, China）
Abstract:The extrusion deformation of spray-deposited 7075Al/SiCp composite was simulated by using rigid-plastic finite element method (FEM) on DEFORM-2D soft word. The condition of numerical simulation on extrusion deformation is that the extrusion ratio is 4−100, preheating temperature of billet is 300−450 ℃ and extrusion ram speed is 2−20 mm/s. The results indicate that the maximum stress and temperature occur in the die entry section. The stress and temperature effect increase with increasing extrusion ratio and ram speed. The optimal processing parameters for the extrusion of 7075Al/SiCp composite are obtained as follows: the billet preheating temperature of 350−400 ℃, extrusion ratio of 16−50 and extrusion ram speed of 5−15 mm/s. The numerical simulation results agree well with experimental ones.
Key words: 7075Al/SiCp composite; spray-deposition; extrusion; rigid-plastic FEM; numerical simulation
