Microstructures and Mechanical Properties of Al-based Bond for Diamond Grinding Wheels by LFC Process

Huang Yuanjian; Dai Qiulian; Luo Canbin; You Fangyi

doi:10.15980/j.tzzz.2015.04.020

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Microstructures and Mechanical Properties of Al-based Bond for Diamond Grinding Wheels by LFC Process
Vol. 35, Issue 4, Pages: 401-405(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.04.020

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[1]黄渊建,戴秋莲,骆灿彬,尤芳怡.消失模铸造金刚石砂轮Al-Cu合金胎体的研究[J].特种铸造及有色合金,2015,35(04):401-405.

Huang Yuanjian, Dai Qiulian, Luo Canbin, et al. Microstructures and Mechanical Properties of Al-based Bond for Diamond Grinding Wheels by LFC Process. [J]. Special Casting & Nonferrous Alloys 35(4):401-405(2015)
[1]黄渊建,戴秋莲,骆灿彬,尤芳怡.消失模铸造金刚石砂轮Al-Cu合金胎体的研究[J].特种铸造及有色合金,2015,35(04):401-405. DOI： 10.15980/j.tzzz.2015.04.020.

Huang Yuanjian, Dai Qiulian, Luo Canbin, et al. Microstructures and Mechanical Properties of Al-based Bond for Diamond Grinding Wheels by LFC Process. [J]. Special Casting & Nonferrous Alloys 35(4):401-405(2015) DOI： 10.15980/j.tzzz.2015.04.020.

摘要

研究了不同含量的Ti和Mg对消失模铸造Al-Cu合金组织和力学性能的影响。结果表明

当Ti含量从0.3%提高至0.9%和1.2%时

其脆性相含量增多且组织形态逐渐粗大

Al-Cu合金的抗弯强度略有降低

但硬度较低。经535℃×15h固溶+70℃水淬+175℃×4h时效后

Al-Cu合金的抗弯强度和硬度均提高了约100%。在Ti含量为0.3%时

添加1.0%的Mg

Al-Cu合金的抗弯强度有所增加

硬度大大提高。Mg含量继续提高到1.5%和2.0%时

Al-Cu合金的硬度虽有所提高

但抗弯强度却有所降低。Mg含量增加的Al-Cu合金经固溶时效处理后

合金的抗弯强度和硬度也显著提高

且Mg含量为1.5%时热处理效果最好。研究结果还显示

金刚石表面镀Ti或增加Al-Cu合金胎体中的Ti含量有利于提高Al-Cu合金胎体对金刚石的把持力。

Abstract

Effects of different Ti and Mg addition as well as heat treatments on the microstructures and mechanical properties of Al-Cu alloys prepared by LFC process were investigated.The results show that the amount and grain size of the brittle phase are increased with the increase of Ti content from 0.3%to0.9% and 1.2%

respectively

which leads to the slight decrease of transverse rupture strength（TRS）of the alloys while the hardness almost keep constant with a lower value.The TRS and hardness of the alloys are almost double the original values after being heat treated by 535℃×4hsolution+70℃water quenching +175 ℃×4haging treatment.When 1.0% of Mg is added into the aluminum-copper alloy with 0.3% Ti

the TRS of the alloy is increased a little while its hardness is increased significantly.The amount of Mg is further increased to 1.5% and 2.0%

hardness of the alloys is continued to increase while the TRS is decreased slightly.The TRS and hardness of the alloys containing different amounts of Mg are increased obviously after being heat treated by 535 ℃×4hsolution+70 ℃ water quenching+175 ℃×4haging treatment

and the optimized result can be presented with 1.5% Mg addition.It is found that diamond grit coated with Ti or adding some amount of Ti into the aluminum-copper alloy can bring a stronger bonding between the metal bonds and diamond grits.