摘要
测试4种A7N01S-T5铝合金的力学性能和断裂韧性,研究了不同合金元素的影响。结果表明:影响A7N01S-T5铝合金性能的3类合金元素适宜的成分配比为Zn(4.34)、Mg(1.43),Mn(0.27)、Cr(0.13),Zr(0.12)、Ti(0.066)。在此条件下,合金的抗拉强度、屈服强度、伸长率、冲击功和断裂韧度分别为415 MPa,378 MPa,13.49%,12.3J和28.950 k J·m-2。极差分析表明,Zn、Mg含量是合金强度与塑性共同的主要影响因素。因此,为了制备出综合性能优异的合金,需选取适当的Zn、Mg含量。对于成分配比适宜的合金,其晶内析出相η′(Mg Zn2)呈细小弥散状分布,而晶界析出相η(Mg Zn2)粗大,呈断续状分布。
The influence of alloying elements on mechanical property and fracture toughness of A7N01S-T5 aluminum alloy was investigated on the basis of impact test, tensile test and three point bending test. The results show that with a proper addition of the selected alloying elements such as Zn（4.34）, Mg（1.43）, Mn（0.27）, Cr（0.13）, Zr（0.12） and Ti（0.066）, the A7N01S-T5 aluminum alloy possesses a comprehensive performance with tensile strength 415 MPa, yield strength 378 MPa, specific elongation13.49%, impact energy 12.3 J and fracture toughness 28.950 k J·m^-2respectively. It is noted that among others the content of Zn and Mg is the main factor influencing both the strength and ductility, therefore,which should be carefully chosen. It is observed that η′ phase precipitates in the grain interior and ηphase precipitates discontinuously at grain boundaries for the A7N01S-T5 aluminum alloy with proper chemical composition.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2015年第7期535-541,共7页
Chinese Journal of Materials Research
基金
国家重点基础研究发展计划2014CB660807
国家科技支撑计划2015BAG12B01
中央高校基本科研经费2682014CX003资助项目~~
