Abstract
The hot cracks of laser powder bed fusion (LPBF) processed ZK60 components were eliminated by adding rare earth element Y. The cause of the cracks in the samples and the suppression mechanism were analyzed in detail. The cracks in ZK60 LPBF samples were mainly caused by the low-melting eutectic phase Mg7Zn3 at the grain boundaries. The average grain size decreased from 7.2 μm to 2.0 μm after adding Y. The I-phase with excellent thermal stability strengthened the grain boundaries. The elimination of cracks was mainly attributed to the I-phase at the grain boundary and the grain refinement.
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