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TWO-STEP AGING BEHAVIOR IN AL-MG-SI ALLOYS FOR BODY PANEL OF AUTOMOBILE

机译:Al-Mg-Si合金的两步老化行为,用于汽车主体面板

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The age hardenable Al-Mg-Si alloys become very attractive due to their good age-hardening response during a paint bake process at 170°C for 1.2 ks, i.e., bake-hardening (BH). There are two types of nanoclusters in Al-Mg-Si alloys. Cluster (1) and Cluster (2) formed at around room temperature and 100°C in Al-Mg-Si alloys, respectively. Due to the limited production process, the negative effects of two-step aging on the mechanical properties are caused in the age hardenable Al-Mg-Si alloys. The hardness is increased during natural aging (NA) due to the formation of Cluster (1) in the 3M4S and 3M10S alloys. The hardness is more increased in the 3M10 than that of the 3M4S. It is noted that the formation of Cluster (1) is accelerated by the addition of Si. The hardness does not increase at the early stage of two-step aging during aging at 170°C. The negative effect of two-step aging is confirmed. Meanwhile, the hardness is decreased at the early stage of aging at 170°C when the NA is performed for 2 month. It means that Cluster (1) is thermally unstable during aging at 170°C. The multi-step aging is designed to understand the role of Cluster (2) in the age-hardening behavior. The hardness is increased after pre-aging (PA). The hardness increase is suppressed during NA after PA, and the hardness is increased during aging at 170°C for 1.2 ks.
机译:由于其在170℃的油漆烘烤过程中,在170℃下为1.2 ks,即烘烤硬化(Bh),所需的年龄可硬化Al-Mg-Si合金具有非常吸引力的良好硬化响应。 Al-Mg-Si合金中有两种类型的纳米团簇。簇(1)和簇(2)分别在室温和100℃下形成的Al-Mg-Si合金。由于生产过程有限,两步老化对机械性能的负面影响是在年龄清除的Al-Mg-Si合金中引起的。由于3M4S和3M10S合金中的簇(1)形成,在天然老化(NA)期间硬度增加。在3M10中的硬度比3M4S的硬度更大。应注意,通过添加Si加速簇(1)的形成。在170℃的老化期间两步老化的早期硬度不会增加。确认了两步老化的负面影响。同时,当Na进行2个月时,在170℃下老化的早期降低,硬度降低。这意味着簇(1)在170℃时在老化期间热不稳定。多步老化旨在了解集群(2)在年龄硬化行为中的作用。预测后(PA)后,硬度增加。在PA之后抑制硬度增加,并且在170℃下老化时,硬度增加1.2 ks。

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