Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第5期    总第230期    2018年5月

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文章编号:1004-0609(2018)-05-0872-08
热锻对喷射成形7055-T6合金组织和性能的影响
温家飞1,张 豪2,张 桢2,向剑波1,罗丰华1

(1. 中南大学 粉末冶金国家重点实验室,长沙 410083; 2. 江苏豪然喷射成形合金有限公司,镇江 212009)

摘 要: 以喷射成形7055-T6铝合金为对象,借助万能力学试验机、电化学工作站、光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)等手段研究热锻对挤压合金显微组织与性能的影响。结果表明:挤压合金的纵向抗拉强度为705 MPa,屈服强度为665 MPa,断口形貌表现为沿晶断裂,而锻造后合金的抗拉强度、屈服强度分别下降了33 MPa和34 MPa,但伸长率、硬度和导电率均有所上升,断口形貌表现为韧性断裂;挤压合金晶粒较均匀,组织有方向性,但热锻后合金部分晶粒长大合并,部分晶粒破碎;合金晶界析出相中的主要元素含量均比基体高,且热锻后合金晶界析出相中的Mg、Zn元素含量降低,Cu元素含量升高;合金经峰值时效后,晶内GP区和η′析出相为主,晶界析出相近似连续分布,导致合金耐蚀性不好;锻造后晶界和晶内析出相均长大粗化,使得合金强度下降,耐蚀性提高。

 

关键字: 喷射成形7055-T6铝合金;锻造态;挤压态;显微组织;性能

Effects of forging on microstructure and mechanical properties of spray forming 7055-T6 alloy
WEN Jia-fei1, ZHANG Hao2, ZHANG Zhen2, XIANG Jian-Bo1, LUO Feng-hua1

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Jiangsu Haoran Spray Forming Alloy Co., Ltd., Zhenjiang 212009, China

Abstract:High strength 7055-T6 aluminum alloys were produced by spray forming. The microstructures and properties of alloy after forging and extrusion were investigated using tensile test, electrochemical workstation, optical microscope(OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM). The results indicate that the tensile strength of the extruded alloy can reach 705 MPa, the yield strength can reach to 665 MPa, and the extruded alloys exhibit an intergranular fracture, the tensile strength and yield strength of the forged alloy decrease by 33 MPa and 37 MPa, respectively, but the elongation, electrical conductivity and hardness all have increased, and the forged alloys exhibit a ductile fracture. The extruded alloys feature fine and homogeneous, the grains are elongated along extrusion, but some grains of forged alloys are broken, and some grains grow up; and the grain boundary precipitates of extruded alloys continuous distribution, the distribution of precipitated phases in grain boundary is dispersive and homogeneous, which leads to a bad corrosion resistance; the precipitated phases of forged alloys have coarsened, which reduce the strength properties but increase the corrosion–resistance.

 

Key words: spray forming 7055-T6 aluminum alloy; as-forged; as-extruded; microstructure; property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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