挤压工艺对高强韧车用铝合金组织和性能的影响

打开文本图片集

中图分类号：TG146.21；TG376 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250128

The Influence of Extrusion Process on the Microstructure and Properties of High-strength and Tough Automotive Aluminum Alloy

Zhang Wei，Yao Lei，Liu Zhaowei， Pan Yan，Li Qiumei，Dai Ziying （LiaoyangXMXYG Aluminum Co.，Ltd.， Liaoyang111003）

Abstract：To investigate the effects of the extrusion process on the microstructureand properties of highstrength，high-toughnessAl-Mg-Siseriesautomotivealuminum allys，asystematicanalysis isconductedonprofiles under diferent processing conditions using methods such asoptical microscopy，transmission electron microscopy， tensiletesting，bending tests，andcrushing tests.Theresultsshow thatincreasing the billettemperatureorextrusion speed raises the quenching entry temperatureof the profileand significantly increases the thickness of thecoarse grain layer.The strength of the aloy improves with therisein quenching entry temperature，butthe bendingand crushing performance decline as the coarse grain layer thickens.Ultimately，itis determined that under process conditions with a billet temperature of 460～480C and an extrusion speed of 4.0～4.5m/min ，orabillet temperature of 480～500 2 and an extrusion speed of 3.0～3.5 m/min，profiles with excellentcomprehensive performance can be obtained，meting automotive requirements for strength，bending，and crushing performance.

Keywords：Extrusion process，Coarse crystal layer，Bending performance，Crushing performance

1前言

Al-Mg-Si合金型材因其优异的成形性、焊接性及耐腐蚀性，近年在汽车工业广泛应用[-2]。（剩余5571字）