摩擦攪拌銲接鋁/銅異質金屬之組織解析與銲接可靠性研究

Microstructural Evaluation and Welding Reliability of Friction Stir Welding Al and Cu Dissimilar Metals

江曉均(Shiau-Jiun Jiang)

指導教授 ： 楊崇煒

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2014年)

https://doi.org/10.6827/NFU.2014.00260

摘要

鍛造鋁和銅合金通常用於同質或是異質接合等工程應用上，然而在一般傳統擴散接合過程中，其製程中的高溫會使鋁/銅間的銲接性及接合強度降低，因此具有低能耗、環保及製程簡易等優點的摩擦攪拌銲接(FSW)的發展受到許多學者的關注。本研究中將選用AA1050、AA6061-T6鋁合金、商用C1100、C2600銅合金等擠型材進行摩擦攪拌銲接之鋁/銅異質金屬接合，而後觀察鋁/銅異質金屬接合之微觀組織、攪拌銲接區之微硬度變化與拉伸機械性質等分析。研究結果顯示AA1050/C1100、AA66061-T6/C1100、AA1050/C2600等鋁/銅異質金屬皆可藉由摩擦攪拌銲接技術順利接合，並藉由WD面組織觀察發現上述各製程皆為無缺陷的銲接表面，並可觀察到明顯的塑性流動在攪拌銲接區中；微硬度方面在攪拌製程後皆有所提升，此外發現介金屬化合物(IMCs)Cu9Al4、CuAl2出現在鋁/銅摩擦攪拌接合介面
；拉伸試驗結果顯示，AA1050/C1100、AA66061-T6/C1100、AA1050/C2600其接合強度分別為107.73、212.2及54.17 MPa；韋伯函數分析結果顯示，上述之鋁/銅異質金屬接合皆屬於破壞率遞增型(IFR)，並可歸納出摩擦攪拌銲接技術對於鋁/銅異質金屬接合為一可靠的銲接製程。

關鍵字

摩擦攪拌銲接 ； 異質金屬 ； 輕金屬 ； 銲接微觀組織 ； 機械性質 ； 韋伯函數

並列摘要

Wrought aluminum (Al) and Cu alloys are generally used by welding with structural homogeneous or dissimilar joints for the engineering applications. However, high temperature of the traditional fusion welding will reduce the weldability and the joining strength of Al/Cu joints. Thus, the development of friction stir welding (FSW) of dissimilar metals, which has energy consumption, eco-friendly and simple welding process, has been focused by many researchers. The aim of the present study is to join the dissimilar Al and Cu alloys by the FSW technique. The AA1050, AA6061-T6 rolled Al alloys, commercial C1100 and C2600 Cu alloys are selected to conduct a friction stir welding of the Al/Cu dissimilar joints, microstructural analysis and microhardness variation of the stir welding zone, and tensile bonding tests for Al/Cu, dissimilar joints. The results indicate that dissimilar AA1050/C1100, AA6061-T6/C1100 and AA1050/C2600 alloys are successfully joined by the FSW technique. The microstructural observation along WD cross-sections showed that the above-mentioned FSW dissimilar alloys are welded with a defect-free welding zone by the significant plastic flow. The microhardness is increased after the welding. In addition, intermetallic compounds (IMCs) of Cu9Al4 and AlCu2 are found at FSW Al/Cu joint interface. Tensile testing results of these dissimilar joints show that the tensile welding strength of AA1050/C1100, AA6061-T6/C1100 and AA1050/C2600 alloys are 107.73, 212.2, and 54.17 MPa, respectively. The Weibull statistical analysis results show that the fracture of the above-mentioned FSW Al/Cu dissimilar joints belongs to an increasing failure rate (IFR) type. The FSW technique is a reliable joining process to weld the Al and Cu dissimilar alloys.

並列關鍵字

Friction stir welding (FSW) ； Dissimilar metals ； Light metals ； Welding microstructure ； Mechanical properties ； Weibull statistics

參考文獻

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