Improved strength and ductility of high alloy containing Al–12Zn–3Mg–2.5Cu alloy by combining non-isothermal step rolling and cold rolling
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第2期
论文作者：V.V.Ravikumar S.Kumaran
文章页码：179 - 185
摘 要：Al–12Zn–3Mg–2.5Cu alloy was prepared using a liquid metallurgy route under the optimized conditions. A sample cut from the ingot was rolled non-isothermally from 400°C to 100°C in 100°C steps,with 15% reduction in thickness; it was then cold rolled isothermally at room temperature for 85% reduction. The cold-rolled alloys were characterized by electron microscopy,hardness test,and tensile test to elucidate their structural evolution and evaluate their mechanical behavior. In the results,the cast alloy consists of α-aluminum and various intermetallic compounds. These compounds are segregated along the grain boundaries,which makes the alloy difficult to roll at room temperature. The combined effect of non-isothermal step rolling and cold rolling results in the nano/microsized compounds distributed uniformly in the matrix. The hardness is substantially increased after rolling. This increase in hardness is attributed to the ultra-fine grain size,fine-scale intermetallic compounds,and structural defects（e.g.,dislocations,stacking faults,and sub-grains）. The ultimate tensile strength of the rolled alloy is approximately 628 MPa with 7% ductility.
V.V.Ravikumar，S.Kumaran
Department of Metallurgical and Materials Engineering,National Institute of Technology
摘 要：Al–12Zn–3Mg–2.5Cu alloy was prepared using a liquid metallurgy route under the optimized conditions. A sample cut from the ingot was rolled non-isothermally from 400°C to 100°C in 100°C steps,with 15% reduction in thickness; it was then cold rolled isothermally at room temperature for 85% reduction. The cold-rolled alloys were characterized by electron microscopy,hardness test,and tensile test to elucidate their structural evolution and evaluate their mechanical behavior. In the results,the cast alloy consists of α-aluminum and various intermetallic compounds. These compounds are segregated along the grain boundaries,which makes the alloy difficult to roll at room temperature. The combined effect of non-isothermal step rolling and cold rolling results in the nano/microsized compounds distributed uniformly in the matrix. The hardness is substantially increased after rolling. This increase in hardness is attributed to the ultra-fine grain size,fine-scale intermetallic compounds,and structural defects（e.g.,dislocations,stacking faults,and sub-grains）. The ultimate tensile strength of the rolled alloy is approximately 628 MPa with 7% ductility.
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