Journal
MATERIALS CHARACTERIZATION
Volume 191, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112142
Keywords
Spray forming; Al-Zn-Mg-Cu alloy; Two-step pretreatment; Recrystallization resistance; Al3Zr precipitate
Categories
Funding
- National Natural Science Foundation of China [52001203, 52071207, 51821001]
- China Postdoctoral Science Foundation [2019TQ0193, 2019M661497]
- AECC CAE Research Program [HT222X.0051-2018]
- Anhui Provincial Engineering Research Center of Aluminium Matrix Composites (China) [52001203]
- [2021WAMC002]
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The influence of temperature of first-step pretreatment on the precipitation and crystal structure of Al3Zr in a spray-formed Al-Zn-Mg-Cu alloy was systematically studied. The results show that the temperature of first-step pretreatment is crucial for stabilizing microstructures, and an optimized pretreatment can significantly enhance the recrystallization resistance during solution treatment.
The influence of temperature of first-step pretreatment on the precipitation and crystal structure of Al3Zr in a spray-formed (SFed) Al-Zn-Mg-Cu alloy was systematically explored. With different first-step pretreatments, the microstructure evolutions during hot extrusion and solution treatment were studied. The results show that pretreatment before hot-working is necessary for rapidly-solidified Al-Zn-Mg-Cu alloy and temperature of first -step pretreatment is crucial for stabilizing microstructures. In detailed, the homogenous nucleation of L1(2) Al3Zr is limited at low first-step temperature (< 250?C), while the transformation from L12 Al3Zr to D023 Al3Zr is simulated and high first-step temperature (>= 420?C). The crystallographic orientation relationship between D023 Al3Zr precipitate (P) and Al matrix is recognized as: [001](Al)//[011](P), (200)(Al)//(011)(P), (020)(Al)//(200)(P), which is different from the previous works. When the first-step temperature is 250-350?C, the dispersed eta-Mg(Zn,Al,Cu)2 phases formed during spray forming can act as heterogeneous nucleation sites of Al3Zr precipitation. The recrystallization resistance of SFed Al-Zn-Mg-Cu alloy during solution treatment is markedly enhanced by an optimized pretreatment of 250?C@36 h + 470?C@24 h.
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