高性能耐热铝合金管材的制备及性能

来源期刊：中南大学学报(自然科学版)2000年第5期

论文作者：袁武华 陈振华

文章页码：437 - 440

关键词：喷射沉积;快速凝固;耐热铝合金

Key words：spray deposition; rapid solidification; heating resisting Al alloy

摘    要：通过多层喷射沉积方法制备了300 mm/150 mm×500 mm(外径/内径×长)耐热铝合金管坯,并对管坯的显微结构及不同加工状态材料性能进行了检测和分析.管坯显微结构细小均匀,除Al₁₂(Fe,V)₃Si外,无其它相析出.管坯经过挤压后,密度由85.9%提高到99.8%;室温强度由210 MPa提高到456 MPa;高温强度由111 MPa提高到181 MPa.挤压管旋压后,室温强度略有降低,高温强度无差别.旋压管径425℃,3 h退火后,室温强度下降约5%,高温强度差别不大.实验结果表明,多层喷射沉积耐热铝合金管坯具有良好的加工性,该技术适合于制备耐热铝合金材料.

Abstract: Heat resisting aluminum alloy pipes with the dimension of outer dia/inner dia×length=300 mm/150 mm×500 mm were prepared by multi-layer spray deposition(MLSD) technology. The microstructures and the mechanical properties at different process stages were tested and analyzed. No other dispersion but Al₁₂(Fe,V)₃Si exists inа-Al matrix. The billet′s ultra strength was increased from 210 MPa to 456 MPa at room temperature and from 111 MPa to 184 MPa at 350℃after extrusion. After consequence latching, the pipe′s properties decrease a little at room temperature and remains unchanged at 350℃. After 3 hours annealing at 425℃,only properties at room temperature have changed, which shows the pipe billets have excellent mechanical property and MLSD is a good way to prepare heat resisting Al alloy.