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首页> 外文期刊>Metallurgical and Materials Transactions A >Effect of Annealing on Thermal Stability, Precipitate Evolution, and Mechanical Properties of Cryorolled Al 7075 Alloy
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Effect of Annealing on Thermal Stability, Precipitate Evolution, and Mechanical Properties of Cryorolled Al 7075 Alloy

机译：退火对冷轧Al 7075合金的热稳定性，析出演化和力学性能的影响

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摘要

The effect of annealing on microstructural stability, precipitate evolution, and mechanical properties of cryorolled (CR) Al 7075 alloy was investigated in the present work employing hardness measurements, tensile test, X-ray diffraction (XRD), differential scanning calorimetry (DSC), electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM). The solution-treated bulk Al 7075 alloy was subjected to cryorolling to produce fine grain structures and, subsequently, annealing treatment to investigate its thermal stability. The recrystallization of CR Al 7075 alloys started at an annealing temperature of 423 K (150 °C) and completed at an annealing temperature of 523 K (250 °C). The CR Al 7075 alloys with ultrafine-grained microstructure are thermally stable up to 623 K (350 °C). Within the range of 523 K to 623 K (250 °C to 350 °C), the size of small η phase particles and AlZr3 dispersoids lies within 300 nm. These small precipitate particles pin the grain boundaries due to the Zener pinning effect, which suppresses grain growth. The hardness and tensile strength of the CR Al 7075 alloys was reduced during the annealing treatment from 423 K to 523 K (150 °C to 250 °C) and subsequently it remains constant.
机译：在本工作中，采用硬度测量，拉伸试验，X射线衍射（XRD），差示扫描量热法（DSC）研究了退火对低温轧制（CR）Al 7075合金的微观结构稳定性，析出物演变和力学性能的影响，电子背散射衍射（EBSD）和透射电子显微镜（TEM）。将固溶处理的块状Al 7075合金进行冷轧以产生细晶粒结构，然后进行退火处理以研究其热稳定性。 CR Al 7075合金的重结晶在423 K（150°C）的退火温度下开始，并在523 K（250°C）的退火温度下完成。具有超细晶粒组织的CR Al 7075合金在高达623 K（350°C）的温度下具有热稳定性。在523 K至623 K（250°C至350°C）范围内，小的η相颗粒和AlZr 3 弥散体的尺寸在300 nm之内。这些小的沉淀颗粒由于齐纳钉扎效应而钉扎晶粒边界，从而抑制了晶粒的生长。在退火处理过程中，CR Al 7075合金的硬度和拉伸强度从423 K降低到523 K（150°C到250°C），并且随后保持恒定。

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