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首页> 美国卫生研究院文献>Materials >Thickening of T1 Precipitates during Aging of a High Purity Al–4Cu–1Li–0.25Mn Alloy
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Thickening of T1 Precipitates during Aging of a High Purity Al–4Cu–1Li–0.25Mn Alloy

机译：高纯Al–4Cu–1Li–0.25Mn合金时效过程中T1沉淀的增厚

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摘要

The age hardening response of a high-purity Al–4Cu–1Li–0.25Mn alloy (wt. %) during isothermal aging without and with an applied external load was investigated. Plate shaped nanometer size T1 (Al2CuLi) and θ′ (Al2Cu) hardening phases were formed. The precipitates were analyzed with respect to the development of their structure, size, number density, volume fraction and associated transformation strains by conducting transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) studies in combination with geometrical phase analysis (GPA). Special attention was paid to the thickening of T1 phase. Two elementary types of single-layer T1 precipitate, one with a Li-rich (Type 1) and another with an Al-rich (Defect Type 1) central layer, were identified. The results show that the Defect Type 1 structure can act as a precursor for the Type 1 structure. The thickening of T1 precipitates occurs by alternative stacking of these two elementary structures. The thickening mechanism was analyzed based on the magnitude of strain associated with the precipitation transformation normal to its habit plane. Long-term aging and aging under load resulted in thicker and structurally defected T1 precipitates. Several types of defected precipitates were characterized and discussed. For θ′ precipitates, a ledge mechanism of thickening was observed. Compared to the normal aging, an external load applied to the peak aged state leads to small variations in the average sizes and volume fractions of the precipitates.
机译：研究了高纯度Al-4Cu-1Li-0.25Mn合金（wt。％）在等温老化条件下（不论是否施加外部载​​荷）的时效硬化响应。形成了板状的纳米尺寸T1（Al2CuLi）和θ'（Al2Cu）硬化相。通过进行透射电子显微镜（TEM）和扫描透射电子显微镜（STEM）结合几何相分析（GPA）的研究，分析了析出物的结构，大小，数量密度，体积分数和相关的转变应变。 。特别注意T1相的增稠。鉴定出两种基本类型的单层T1沉淀物，一种具有中心富锂（类型1），另一种具有中心富铝（缺陷类型1）。结果表明，缺陷1型结构可以充当1型结构的前兆。 T1沉淀物的增厚是通过这两个基本结构的交替堆叠而发生的。基于与垂直于其习性平面的降水转化相关的应变的大小来分析增稠机理。长期老化和在负载下老化会导致T1沉淀物变厚和结构缺陷。表征和讨论了几种类型的缺陷析出物。对于θ'析出物，观察到壁架增厚的机理。与正常老化相比，施加到峰值老化状态的外部负载导致沉淀物的平均尺寸和体积分数的微小变化。

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