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首页> 外文期刊>Journal of Materials Engineering and Performance >Sagging Mechanisms of Three-Layer Aluminum Clad Foils used in the Heat Exchanger in the Brazing Process
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Sagging Mechanisms of Three-Layer Aluminum Clad Foils used in the Heat Exchanger in the Brazing Process

机译：钎焊过程中热交换器中使用的三层铝包覆箔的下垂机制

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摘要

The sagging mechanisms of a three-layer aluminum clad foils (AA4343/AA3003Mod/AA4343) with final rolling reduction of 20-50% during brazing were studied. The results show that the sagging behavior of the aluminum brazed foils during the brazing cycle can be divided into four stages: Stage I is the slight sagging stage, during which sagging deformation can almost be ignored; Stage II is referred to as the accelerative sagging stage, and the sagging behavior is mainly ascribed to recovery. In stage II, the greater the reduction ratio is, the earlier the recovery ends, and the smaller the value of the sagging distance is. Stage III is the slow sagging stage, and sliding deformation along the grain boundaries is responsible for the slow sagging rate. Stage IV is the erosion stage. During stage IV, the coarsely recrystallized grains can inhibit erosion and are helpful in obtaining excellent sagging resistance, while the foils with finely recrystallized grains or non-recrystallized structure show severe erosion and limited sagging resistance.
机译：研究了三层铝包覆箔（AA4343 / AA3003Mod / AA4343）的下垂机制，在钎焊期间最终轧制减少20-50％。结果表明，钎焊循环期间铝钎焊箔的下垂行为可分为四个阶段：阶段I是轻微的下垂阶段，在此期间可以忽略下垂变形;阶段II被称为加速下垂阶段，下垂行为主要归因于恢复。在阶段II中，减少比率越大，较早的回收末端，并且下垂距离的值越小。阶段III是缓慢下垂阶段，沿着晶界的滑动变形负责下垂的速度。阶段IV是侵蚀阶段。在阶段IV期间，粗的重结晶晶粒可以抑制侵蚀并且有助于获得优异的下垂性，而具有精细重结晶的晶粒或非重结晶结构的箔显示出严重的侵蚀和有限的下垂性。

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