加Ti、B方式对A356合金冲击韧度的影响

刘栓江; 刘忠侠; 杨明生; 张天清; 刘扭参

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加Ti、B方式对A356合金冲击韧度的影响
Effect of the Ti、B alloying methods on the impact toughness of A356 alloys
2008年第S1期页码：168-171
纸质出版日期： 2008 ，
DOI：

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[1]刘栓江,刘忠侠,杨明生,张天清,刘扭参.加Ti、B方式对A356合金冲击韧度的影响[J].特种铸造及有色合金,2008(S1):168-171.

Effect of the Ti、B alloying methods on the impact toughness of A356 alloys[J]. Special Casting & Nonferrous Alloys, 2008,(S1):168-171.
[1]刘栓江,刘忠侠,杨明生,张天清,刘扭参.加Ti、B方式对A356合金冲击韧度的影响[J].特种铸造及有色合金,2008(S1):168-171. DOI：

Effect of the Ti、B alloying methods on the impact toughness of A356 alloys[J]. Special Casting & Nonferrous Alloys, 2008,(S1):168-171. DOI：

摘要

通过对比实验研究了在相同Ti含量和相同Ti、B质量比时加Ti、B方式对A356合金冲击韧度的影响。结果表明

Ti、B加入的方式对A356合金冲击韧度的影响明显

采用电解加Ti进行细化的A356合金微观组织较细

冲击韧度最高。原因在于晶粒细化导致裂纹的扩展自由程增加

从而增加了裂纹的扩展阻力和断裂抗力。虽然电解加Ti+Al-B中间合金细化方式合金的冲击韧度与其它两种Ti、B联合细化方式差别较小

但由于具有高的裂纹扩展功

因此具有较高的断裂抗力。

Abstract

The impact toughness of A356 alloys with the same ratio of w（Ti）/w（B） and the same titanium content

produced by different Ti and B alloying methods were investigated. The results show that the Ti、B alloying methods has an obvious effect on the microstructure and impact toughness of A356 alloys.

The A356 alloys produced by electrolytic low-titanium aluminium alloys have the optimum grain refinement effect and impact toughness. The reason is that the refinement of microstructure increases the growth free path of microcrac. The microcrack growth need absorb higher propagation energy. Though the impact toughness of A356 alloys refined with electrolytic low-titanium aluminium alloys+Al-B master alloys almost has the same values as that alloys alloyed with melting Al-Ti-B master alloys and melting K2TiF6+KBF4

the former alloys have the higher fracture resistance than that of the latter alloys because of the former alloys have higher crack propagation energy.