Hot crack susceptibility of cast Mg97Y2Zn1

• Published in: Engineering reports (Hoboken, N.J.) N.J.), 2022-07, Vol.4 (7-8), p.n/a
• Main Authors: Krbetschek, Christina, Trân, Ricardo, Wemme, Heike, Ullmann, Madlen, Prahl, Ulrich, Rafaja, David
• Format: Article
• Language: English
• Subjects: brittle temperature range (BTR); Cracks; Dissolution; Ductility; Ductility tests; Fracture surfaces; Gleeble testing; Grain boundaries; Grain size; hot crack tendency; Hot cracks; Magnesium alloys; Mechanical properties; Mechanical tests; Metal forming; Solidification; solidification range; Solids; Surface analysis (chemical); Tensile tests
• ISSN: 2577-8196; 2577-8196
• DOI: 10.1002/eng2.12380

Formation of hot cracks in alloys is a critical issue for their production and processing. In this study, the susceptibility of the cast Mg97Y2Zn1 alloy containing long period stacking ordered (LPSO) structures to hot cracking was investigated using tensile tests in a Gleeble testing machine, and described in terms of the brittle temperature range (BTR), which was concluded from the zero strength temperature (ZST), zero ductility temperature, and ductility recovery temperature (DRT). The zero ductility and the DRTs were obtained directly from the mechanical tests, verified using fracture surface analysis in a scanning electron microscope, and correlated with the solidification range that was determined using differential scanning calorimetry. The extent of the BTR was 31 K, the width of the solidification range 100 K. The ZST coincided with the dissolution temperature of the LPSO structures, which means that the hot cracking susceptibility of the cast Mg97Y2Zn1 alloy is dominated by the dissolution of LPSO structures. Formation of hot cracks in alloys is a critical issue for their production and processing. In this study, the susceptibility of the cast Mg97Y2Zn1 alloy containing long period stacking ordered structures to hot cracking was investigated using tensile tests in a Gleeble testing machine, and described in terms of the brittle temperature range (BTR), which was concluded from the zero strength temperature (ZST), zero ductility temperature (ZDT), and ductility recovery temperature (DRT). Additionally, the solidification range of the Mg97Y2Zn1 alloy was determined by means of the differential scanning calorimetry.