摘要
通过硬度测量、拉伸和成形性试验,并采用透射电镜、扫描电镜及金相分析,研究了wMg/wSi和wMg/wCu值对几种6000系汽车板铝合金时效行为、力学性能及成形性的影响。结果表明:在时效初期,对于硅过剩合金,其硬度和强度随wMg/wSi和wMg/wCu值增大而提高;对于镁过剩合金,其比值过大时则硬度和强度显著下降。但伸长率及埃利克森值随比值增大均为降低。此外,增大wMg/wCu值会促进合金时效初期的硬化速度,但wMg/wCu过大,初始硬度大为降低,反而不利于合金的时效硬化性。
The effects of wMg/wSi and wMg/wCu ratios on aging behavior, tensile properties and formability of several 6 000 series aluminium alloys for automobile body sheets were investigated by means of transmission electron microscopy (TEM), scan electron microscopy (SEM/EDS), metallography, hardness, tensile and formability tests. In early aging stage, the strength and hardness increased with increment of wMg/wSi and wMg/wCu values for Si-excess alloys. For Mg-excess alloys, their strength and hardness decreased significantly. But both elongation and Erichsen value reduced with increasing ratios. In addition, the enhancement of wMg/wCu value could promote the initial aging speed of hardening. Excessive wMg/wCu value causesd the primary hardness reduced a lot, which was not beneficial for the aging hardenability of alloys.
出处
《机械工程材料》
CAS
CSCD
北大核心
2005年第6期10-13,66,共5页
Materials For Mechanical Engineering
基金
国家863计划资助项目(2002 AA331050)教育部科学技术研究重大资助项目(0208)国家教育部高等学校优秀青年教师教学科研奖励计划
关键词
6000系铝合金
汽车板
硬度
时效硬化
6 000 series aluminium alloy
auto sheet
hardness
aging hardening