Refill Friction Stir Spot Welding of a Graphene-Reinforced AA 6061 Aluminum Alloy: Refill Friction Stir Spot Welding of a Graphene-Reinforced AA 6061 Aluminum Alloy: Wu, Liu, Ji, Sui, and Li. - Wu, Tong; Liu, Yuding; Ji, Shan; Sui, Xiaochong; Li, Zhengwei (JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2025)