冷速和热处理对Al-Si-Cu-Mg-Ni合金组织和性能的影响

余海洋; 刘畅; 杨宏韬; 郎巳良; 孙传坤; 周任重; 周芷西; 严红革

doi:10.15980/j.tzzz.2014.05.021

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冷速和热处理对Al-Si-Cu-Mg-Ni合金组织和性能的影响
Effects of Cooling Rate and Heat Treatment on Microstructure and Mechanical Properties of Al-Si-Cu-Mg-Ni Alloy
2014年34卷第5期页码：545-549
纸质出版日期： 2014 ，
DOI： 10.15980/j.tzzz.2014.05.021

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[1]余海洋,刘畅,杨宏韬,郎巳良,孙传坤,周任重,周芷西,严红革.冷速和热处理对Al-Si-Cu-Mg-Ni合金组织和性能的影响[J].特种铸造及有色合金,2014,34(05):545-549.

Yu Haiyang, Liu Chang, Yang Hongtao, et al. Effects of Cooling Rate and Heat Treatment on Microstructure and Mechanical Properties of Al-Si-Cu-Mg-Ni Alloy[J]. Special Casting & Nonferrous Alloys, 2014,34(5):545-549.
[1]余海洋,刘畅,杨宏韬,郎巳良,孙传坤,周任重,周芷西,严红革.冷速和热处理对Al-Si-Cu-Mg-Ni合金组织和性能的影响[J].特种铸造及有色合金,2014,34(05):545-549. DOI： 10.15980/j.tzzz.2014.05.021.

Yu Haiyang, Liu Chang, Yang Hongtao, et al. Effects of Cooling Rate and Heat Treatment on Microstructure and Mechanical Properties of Al-Si-Cu-Mg-Ni Alloy[J]. Special Casting & Nonferrous Alloys, 2014,34(5):545-549. DOI： 10.15980/j.tzzz.2014.05.021.

摘要

通过具有不同冷却速率的阶梯型金属型制备出Al-Si-Cu-Mg-Ni合金

并进行固溶时效处理（T6）

利用光学显微镜、XRD和SEM分析研究铝合金不同状态下的显微组织和力学性能。结果表明

冷却速率越大

合金的二次枝晶臂间距越小

抗拉强度、屈服强度、硬度和伸长率越大;热处理能明显地提高合金的力学性能。经T6处理后

共晶Si尺寸变得均匀细小

且弥散分布在α-Al基体中。截面厚度为20mm的合金热处理后抗拉强度、屈服强度和硬度（HB）分别为367MPa、229MPa和125

相对于铸态的分别提高了49.2%、54.7%和34.3%。合金拉伸断口呈现出大量韧窝和一定数量解理平面的混合形貌

表现为混合断裂特征。

Abstract

The ladder-type Al-Si-Cu-Mg-Ni alloy samples were prepared by metal mold at different cooling rates and treated by T6heat treatment.The microstructure and mechanical properties of the Al alloys under different conditions were investigated by optical microscope（OM）

X-ray diffractometer（XRD） and scanning electron microscope（SEM）.The results indicate that the secondary dendrite arm spacing（SDAS）of alloy is decreased

and the tensile strength

yield strength

hardness and elongation are increased gradually with the cooling rate increase.Heat treatment can improve significantly the mechanical properties of the alloy.After T6treatment

the uniform and fine eutectic-Si is distributed dispersedly in theα-Al matrix.The tensile strength

yield strength and hardness of the alloy with 20mm in cross-section thickness after heat treatment reach 367 MPa

229 MPa and 125HB

about 49.2%

54.7% and 34.3% higher than those of the as-casted alloy

respectively.Tensile fracture of the alloy is characterized by a mixed morphology of a large number of dimples and a number of cleavage plane.