摘要
采用室温拉伸的方法,研究170~180℃范围内时效不同时间2124铝合金厚板高向(ST向)力学性能的变化。利用透射显微镜(TEM)、扫描电镜(SEM)观察合金不同时效工艺下组织形貌特征。结果表明:2124铝合金板材适宜的T851时效制度为175℃保温10h,此条件下合金高向的屈服强度,抗拉强度,伸长率分别为372,422MPa,2.9%。此时主要的强化相为S′相,含有少量的GPB区以及粗大的T相。时效温度是影响合金析出相密度和尺寸的主要因素,时效温度越高,强度上升越快,达到强度最大值的时间越短。基体与晶界处的强度差越来越大是导致伸长率降低的主要原因。
Mechanical properties of 2124 aluminum alloy thick plate in short-transverse direction were investigated when ageing at 170-180℃for different time by room temperature tensile test.The microstructure morphology of alloy after different ageing processes was studied by TEM and SEM.The results show that the suitable ageing process of 2124 aluminum alloy plates is 175℃for 10h.Yield strength,tensile strength and elongation are 372,422MPa and 2.9%,respectively.The main precipit-ation is S′phase,and also a small quantity of GPB zone and coarse T phase exist at this moment.Ageing temperature is the main factor affecting the density and size of the alloy precipitation.The higher the ageing temperature is,the quicker the rising of strength,the shorter time to reach the maximum strength.The increasing strength difference between the matrix and grain boundary is the main cause for the decrease of the elongation.
作者
臧金鑫
陈军洲
伊琳娜
汝继刚
ZANG Jin-xin;CHEN Jun-zhou;YI Lin-na;RU Ji-gang(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering Research Center of AdvancedAluminum Alloys and Applications,Beijing 100095,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第12期98-103,共6页
Journal of Materials Engineering
关键词
2124铝合金
时效处理
微观组织
力学性能
2124 aluminum alloy
ageing treatment
microstructure
mechanical property
