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Development of Precipitation Hardening Parameters for High Strength Alloy AA 7068

机译：高强度合金AA 7068沉淀硬化参数的发展

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摘要

The mechanical properties after age hardening heat treatment and the kinetics of related phase transformations of high strength AlZnMgCu alloy AA 7068 were investigated. The experimental work includes differential scanning calorimetry (DSC), differential fast scanning calorimetry (DFSC), sophisticated differential dilatometry (DIL), scanning electron microscopy (SEM), as well as hardness and tensile tests. For the kinetic analysis of quench induced precipitation by dilatometry new metrological methods and evaluation procedures were established. Using DSC, dissolution behaviour during heating to solution annealing temperature was investigated. These experiments allowed for identification of the appropriate temperature and duration for the solution heat treatment. Continuous cooling experiments in DSC, DFSC, and DIL determined the kinetics of quench induced precipitation. DSC and DIL revealed several overlapping precipitation reactions. The critical cooling rate for a complete supersaturation of the solid solution has been identified to be 600 to 800 K/s. At slightly subcritical cooling rates quench induced precipitation results in a direct hardening effect resulting in a technological critical cooling rate of about 100 K/s, i.e., the hardness after ageing reaches a saturation level for cooling rates faster than 100 K/s. Maximum yield strength of above 600 MPa and tensile strength of up to 650 MPa were attained.
机译：研究了时效硬化热处理后的力学性能以及高强度AlZnMgCu合金AA 7068的相关相变动力学。实验工作包括差示扫描量热法（DSC），差示快速扫描量热法（DFSC），复杂的差示膨胀法（DIL），扫描电子显微镜（SEM）以及硬度和拉伸试验。为了用膨胀计动力学分析急冷引起的降水，建立了新的计量方法和评估程序。使用DSC，研究了加热至固溶退火温度期间的溶解行为。这些实验可以确定固溶热处理的合适温度和持续时间。在DSC，DFSC和DIL中进行的连续冷却实验确定了淬火诱发沉淀的动力学。 DSC和DIL显示出几个重叠的沉淀反应。固溶体完全过饱和的临界冷却速率已确定为600至800 K / s。在稍次临界的冷却速率下，淬火引起的沉淀导致直接的硬化效果，导致技术上的临界冷却速率为约100 K / s，即，老化后的硬度达到了高于100 K / s的冷却速率的饱和水平。获得了超过600 MPa的最大屈服强度和高达650 MPa的拉伸强度。

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