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首页> 外文期刊>Journal of Materials Engineering and Performance >Softening Behavior of a New Al-Zn-Mg-Cu Alloy Due to TIG Welding
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Softening Behavior of a New Al-Zn-Mg-Cu Alloy Due to TIG Welding

机译：TIG焊接导致的新型Al-Zn-Mg-Cu合金的软化行为

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摘要

A new Al-Zn-Mg-Cu alloy with T6 temper was welded by TIG welding, and the softening behavior of the joint was evaluated. Results show that the ultimate tensile strength of the joint is 436.2 +/- A 26.4 MPa which is about 64.5% of that of the base metal (BM). Fusion zone (FZ) is the weakest region even though its microhardness increases from 107.6 to 131.3 HV within 90 days after welding. Microhardness of the heat-affected zone (HAZ) adjacent to FZ increases from 125.2 to 162.3 HV within 90 days. However, a valley value of microhardness appears in the rest of the HAZ that increases from 112.1 to 128.1 HV within 90 days. The variation of grain size and precipitates is regarded as the main cause of softening in both FZ and HAZ. The grain size of FZ is about 33.9 mu m, whereas 8.7 and 8.4 mu m for HAZ and BM, respectively. A large number of eta' phases distribute dispersively in BM, whereas precipitates in FZ identified as GPI zones are finer and fewer. Besides, precipitates in HAZ adjacent to FZ are also GPI zones. Precipitates in HAZ far away from FZ are coarser and fewer than those in BM and eta phases begin to emerge.
机译：通过TIG焊焊接了一种新的T6回火Al-Zn-Mg-Cu合金，并对接头的软化性能进行了评估。结果表明，接头的极限抗拉强度为436.2 +/- A 26.4 MPa，约为母材（BM）的64.5％。熔合区（FZ）是最薄弱的区域，即使在焊接后90天内其显微硬度从107.6 HV增加到131.3 HV。与FZ相邻的热影响区（HAZ）的显微硬度在90天内从125.2 HV增加到162.3 HV。但是，在90天内，其余热影响区会出现微硬度谷值，从112.1 HV增加到128.1 HV。晶粒尺寸和沉淀物的变化被认为是FZ和HAZ中软化的主要原因。 FZ的晶粒尺寸约为33.9微米，而HAZ和BM的晶粒尺寸分别为8.7和8.4微米。大量的eta'相分散在BM中，而在FZ中被识别为GPI区域的沉淀更细，更少。此外，与FZ相邻的HAZ中的沉淀物也是GPI区。远离FZ的热影响区中的沉淀物比BM和eta相中的沉淀物更粗糙且更少。

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