K<sub>2</sub>ZrF<sub>6</sub>对A356合金凝固组织及力学性能的影响

周维; 张云波; 胡鹏鹤; 邓鹏; 韩山奇; 张磊

doi:10.15980/j.tzzz.2016.08.022

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K₂ZrF₆对A356合金凝固组织及力学性能的影响
Effect of K₂ZrF₆ on Microstructure and Mechanical Properties of A356 Alloys
2016年36卷第8期页码：860-862
纸质出版日期： 2016 ，
DOI： 10.15980/j.tzzz.2016.08.022

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[1]周维,张云波,胡鹏鹤,邓鹏,韩山奇,张磊.K_2ZrF_6对A356合金凝固组织及力学性能的影响[J].特种铸造及有色合金,2016,36(08):860-862.

Zhou Wei, Zhang Yunbo, Hu Penghe, et al. Effect of K₂ZrF₆ on Microstructure and Mechanical Properties of A356 Alloys[J]. Special Casting & Nonferrous Alloys, 2016,36(8):860-862.
[1]周维,张云波,胡鹏鹤,邓鹏,韩山奇,张磊.K_2ZrF_6对A356合金凝固组织及力学性能的影响[J].特种铸造及有色合金,2016,36(08):860-862. DOI： 10.15980/j.tzzz.2016.08.022.

Zhou Wei, Zhang Yunbo, Hu Penghe, et al. Effect of K₂ZrF₆ on Microstructure and Mechanical Properties of A356 Alloys[J]. Special Casting & Nonferrous Alloys, 2016,36(8):860-862. DOI： 10.15980/j.tzzz.2016.08.022.

摘要

在A356合金熔体中加入K2ZrF6

主要研究不同K2ZrF6含量对A356合金凝固组织及力学性能的影响。结果表明

随着K2ZrF6加入量的增加

初生α-Al相形貌由粗大的树枝晶状转变为细小的等轴枝晶状。共晶Si相形貌随着K2ZrF6加入量的增加

由粗大针片状逐步转变为蠕虫状和颗粒状

但当加入量超过1.0%后

合金出现过变质现象。随着K2ZrF6加入量的增加

合金的力学性能呈先增加后减小的趋势。当加入1.0%的K2ZrF6时

合金抗拉强度和伸长率相比未处理的合金

分别提高了29%和95%。

Abstract

Effects of K2ZrF6 content on the microstructure and mechanical properties of A356 alloy were investigated.The results show that the microstructure of A356 alloy with K2ZrF6 addition is improved significantly.With increasing in K2ZrF6 addition

the morphology of primaryα-Al is converted from developed dendrite to fine equiaxed dendrite.Moreover

the morphology of eutectic Si is modified from coarse acicular to fine vermicular and particle-like.However

the alloy exhibits over-modification with the addition more than 1.0%.Mechanical properties of A356 Alloy are increased firstly and then decreased.With 1.0% K2ZrF6 addition

the tensile strength and elongation of A356 alloy are increased by29% and 95%

respectively

compared with those of alloy without K2ZrF6 addition.