Microhardness and microstructure characteristics of AZ91 magnesium alloy under different cooling rate conditions

被引：16
作者：
Abd El-Rehim, A. F. [1 ,2 ]
Zahran, H. Y. [1 ,2 ]
Al-Masoud, H. M. [1 ]
Habashy, D. M. [2 ]
机构：
[1] King Khalid Univ, Dept Phys, Fac Sci, POB 9004, Abha 61413, Saudi Arabia
[2] Ain Shams Univ, Fac Educ, Dept Phys, POB 5101, Cairo 11771, Egypt
来源：
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 08期
关键词：
AZ91 magnesium alloys; heat treatment; cooling rate; hardness; microstructure; artificial neural network; AGING BEHAVIOR; CREEP-BEHAVIOR; CONTINUOUS PRECIPITATION; CELLULAR PRECIPITATION; MECHANICAL-PROPERTIES; HEAT-TREATMENT; MG; HARDNESS;
D O I：
10.1088/2053-1591/ab1ad6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The objective of the present work is to investigate the influence of aging time and cooling rate conditions on the microstructure and mechanical properties of AZ91 magnesium alloy. After solution heat treatment condition, samples were isothermally aged at 200 degrees C for various times ranging from 4 to 192 h followed by cooling in two different media: water and furnace which resulted in cooling rates of 20 degrees C s(-1) (fast cooling rate) and 0.1 degrees C s(-1) (slow cooling rate) respectively. The results revealed that the hardness values for the faster cooling rate are higher than that of the smaller cooling rate. Maximum hardness has been achieved after aging for 24 h for both two cooling conditions. The influence of both continuous and discontinuous precipitates of beta-phase, as a function of aging time and cooling rate, on the age-hardening response has been elaborated. An artificial neural network (ANN) model was applied to simulate and predict the hardness profile of the investigated alloy. The experimental data were confirmed by the calculated results.
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页数：15
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