仲维锋,庄利珍,滕敦波,李辉.时效处理对Al-0.78Mg-1.02Si-0.68Cu合金硬化行为及微观组织的影响[J].有色金属工程,2019,9(9):.
时效处理对Al-0.78Mg-1.02Si-0.68Cu合金硬化行为及微观组织的影响
Influence of aging treatment on hardening behavior and microstructure of Al-0.78Mg-1.02Si-0.68Cu alloy
投稿时间:2019-01-07  修订日期:2019-02-26
DOI:
中文关键词:  AlMgSiCu合金,时效处理,硬化行为,析出强化相,PFZ区
英文关键词:AlMgSiCu alloy  aging treatment  hardening behavior  precipitation strengthen phase  PFZ zone
基金项目:山东省高校科技计划(J18KA028),山东省重点研发项目(2017GGX20119),烟台重点研发计划(2017ZH081)
           
作者单位
仲维锋 烟台南山学院
庄利珍 烟台南山学院
滕敦波 烟台南山学院
李辉 烟台南山学院
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中文摘要:
      本文研究了预时效处理(PA)、自然时效(NA)和人工时效(AA)过程AlMgSiCu合金的硬化行为及微观组织演变,测试了显微硬度,表征了透射精细组织。结果表明:预时效处理,提高了T4P态的初期硬度,却明显弱化NA硬化效应,T4态NA硬化值34HV,而T4P态只有25HV。180℃AA过程,显微硬度总体呈现先升高后降低的趋势,硬化曲线可以分为三个区域:20~60min之间硬化速率较高(Ⅰ);60~480min之间硬化速率较低(Ⅱ),在480min达到峰值硬度127HV;随后呈现降低的趋势(Ⅲ)。T4P态NA后,晶内为与基体共格的GP区;AA处理后,晶内主要为与基体半共格的亚稳η’’析出相,晶界处存在长度15~40nm的不连续析出物和宽度45nm左右的PFZ区。
英文摘要:
      The hardening behavior and microstructure evolution of AlMgSiCu alloy after pre-aging(PA) treatment, natural aging(NA) treatment and artificial aging(AA) treatment were investigated in this paper. The micro-hardness was tested. The TEM microstructure was characterized. The results indicate that PA treatment increases the hardness of the initial state, while decreases the NA effect. The NA hardening value arrives 34HV of T4 state, while T4P has a value of 25HV. The micro-hardness increases first and then decreases with increasing aging time during aging at 180℃. The hardening curve could be divided into three parts: higher hardening rate zone(Ⅰ, 20~60min), slow hardening rate zone(Ⅱ, 60~480min) and decreasing zone(Ⅲ). The peak value of hardness(127HV) arrives at 480min. The coherent GP zones are the main phase after NA of T4P state, whereas semi-coherent η’’ phase are the dominant phase after AA treatment. The discontinuous precipitation with a size of 15~40nm and PFZ zone with a width of 45nm exist at grain boundaries.
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