Phase transformations in commercial cold-rolled Al–Zn–Mg–Cu alloys with Sc and Zr addition

THERMAL CHARACTERISTICS AND ELECTRICAL PROPERTIES OF HOT DEFORMED AA7075 ALLOYS WITH AND WITHOUT Sc, Zr ADDITIONS

“…The average size of primary Al3(Sc,Zr) particles was 2-5 μm and structure of layers was identified as Al3(Sc+Zr) + -Al + Al3(Sc+Zr) + -Al + .... These results are in agreement with [13][14][15].…”

“…See eutectic phase and detail of primary Al3(Sc,Zr) particles are probably caused by presence of Sc,Zr-containing particles and/or by higher content of addition in the AlZnMgCuScZr alloy. The initial values of HV0.5 was in the same studied alloys in the as-prepared state HV0.5 ≈ 120 for the AlZnMgCu and HV0.5 ≈ 130 for the AlZnMgCuScZr alloy [13,15].…”

“…The Al3(Sc,Zr) phase is more stable at higher temperatures than the Al3Sc and/or Al3Zr phase and also has a distinctive hardening effect [1,11,12]. Primary intermetallic particles Al3Sc and/or Al3Zr and/or Al3(Sc,Zr) were observed in the cast ingots with Sc, Zr-additions [13][14][15]. These particles are rectangular, triangular and/or polygonal with dimension about 2-5 μm and mostly appear inside (in the centre of) the grains [13][14][15].…”

“…Primary intermetallic particles Al3Sc and/or Al3Zr and/or Al3(Sc,Zr) were observed in the cast ingots with Sc, Zr-additions [13][14][15]. These particles are rectangular, triangular and/or polygonal with dimension about 2-5 μm and mostly appear inside (in the centre of) the grains [13][14][15]. These particles in AlZnMgCu-based alloys consist of layers Al3(Sc+Zr) + α-Al + Al3(Sc+Zr) + α-Al ... [13][14][15].…”

“…These particles are rectangular, triangular and/or polygonal with dimension about 2-5 μm and mostly appear inside (in the centre of) the grains [13][14][15]. These particles in AlZnMgCu-based alloys consist of layers Al3(Sc+Zr) + α-Al + Al3(Sc+Zr) + α-Al ... [13][14][15].…”