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关于AA7A65的对称和不对称双面FSW接头的微观结构和机械性能的比较研究
Chen Chen1, Yichao Zhu2, Zhiping He1
1China Helicopter Research and Development Institute, Jingdezhen 333001, China.
Materials (Basel, Switzerland)
|February 13, 2025
概括
与传统方法相比,不对称双面摩擦接接 (Asy-DS-FSW) 通过提炼颗粒和增强机械性能来改善厚板合金接头.
科学领域:
- 材料科学 材料科学 材料科学
- 制造业 工程 制造工程
- 接技术 接技术
背景情况:
- 双面摩擦接 (DS-FSW) 对于厚板连接是有利的,因为设备需求低,热量投入低.
- 然而,在DS-FSW中重复的热循环会导致谷物生长和软化,降低关节性能.
研究的目的:
- 引入和评估一种不对称的DS-FSW (Asy-DS-FSW) 技术,用于连接厚板合金.
- 为了减轻传统DS-FSW固有的谷物生长和软化问题.
主要方法:
- 开发了一个Asy-DS-FSW工艺,使用一个大工具进行第一个接,一个小工具进行第二个接.
- 将Asy-DS-FSW技术应用于27毫米厚的AA7A65合金接头.
- 评估了关节的微观结构,硬度分布和拉伸性能.
主要成果:
- Asy-DS-FSW有效地提炼了谷物,并在厚厚的AA7A65关节中抑制了二次谷物生长.
- 与对称的DS-FSW (Sym-DS-FSW) 相比,Asy-DS-FSW接头表现出更高和更均的硬度.
- 最终抗拉强度增加了0.5-11%,在Asy-DS-FSW关节中观察到缓解应变局部化.
结论:
- Asy-DS-FSW为结合厚合金板提供了一种优越的方法,克服了传统DS-FSW的局限性.
- 该技术增强了机械性能和均性,为航空航天应用提供了宝贵的见解.
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