“…Considering the type of heterogeneous samples, different reactions may cause the development of the connection. For example, in the Al–Mg and zirconia connection, Al and Mg atoms react with the grain boundary phases of zirconia and zirconia itself (ZrO 2 ), leading to the development of the connection [ [16] , [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] , [35] , [36] , [37] , [38] ].…”