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The microstructure and mechanical properties of newly developed Al–35Zn cast alloys with Ti B re?ner addition were evaluated by X-ray diffractometry, optical microscopy, and scanning electron microscopy coupled with energy dispersive spectrometry. The microstructure of these alloys featured α-Al dendrites surrounded by Al–Zn(α + η) eutectic structures. After the addition of Ti B re?ner, the alloy grain sizes decreased, and its morphology abruptly changed from dendritic to equiaxed grains. Such an improved microstructure of the modi?ed alloys was accompanied by a signi?cant increase in the tensile strength and elongation percentage compared to those of the Al–Zn or Zn–Al-based alloys. The results showed that with the increase of Ti B content up to 0.05%, the morphology of α-Al dendrites and α + ηphases changed from coarse dendrite and lamellar structures into independent and ?ne ones. Based on these results, the effect of Ti B re?ner addition on the microstructure and mechanical properties of the Al–35Zn binary alloys was investigated.
The microstructure and mechanical properties of newly developed Al-35Zn cast alloys with Ti B re? Ner addition were evaluated by X-ray diffractometry, optical microscopy, and scanning electron microscopy coupled with energy dispersive spectrometry. The microstructure of these complexes featured α-Al dendrites surrounded by Al-Zn (α + η) eutectic structures. After the addition of Ti B re? ner, the alloy grain sizes decreased decreased, and its morphology abruptly changed from dendritic to equiaxed grains. Such an improved microstructure of the modi? ed alloys was accompanied by a signi? cant increase in the tensile strength and elongation percentage compared to those of the Al-Zn or Zn-Al-based alloys. The results showed that with the increase of Ti B content up to 0.05%, the morphology of α-Al dendrites and α + ηphases changed from coarse dendrite and lamellar structures into independent and neighbors. Based on these results, the effect of Ti B re? ner addition on the microstructure and mech anical properties of the Al-35Zn binary alloys was investigated.