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19卷    第9期    总第126期    2009年9月

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文章编号:1004-0609(2009)09-1570-05
超高压力对ZA27合金晶体结构及微观组织的影响
李荣德,曹修生,曲迎东,谢 尧,李润霞,田 畅

(沈阳工业大学 材料科学与工程学院,沈阳 110178)

摘 要: 采用高机械压力方法制备ZA27合金试样,通过X射线和金相分析手段研究晶体结构与组织变化。结果表明:随着压力的增加,晶面间距和晶格常数都逐渐减小,当压力达到5 GPa时,富铝α相在(200)与(220)晶面    处,晶面间距较常压力时的分别减小1.07%和1.15%;在常压至3 GPa范围内,晶粒由粗大的树枝晶→细小的树枝晶→粒状、椭球状枝晶转变的趋势,通过压力对合金凝固溶质扩散系数的影响结合Scherrer公式计算分析其组织变化原因,得出在一定的压力范围内,随着压力的增大,晶粒尺寸逐渐变小,这一结论与实验结果相符。

 

关键字: 超高压;ZA27合金;晶体结构;晶粒组织

Effect of super high pressure on crystal structure and microstructure of ZA27 alloy
LI Rong-de, CAO Xiu-sheng, QU Ying-dong, XIE Yao, LI Run-xia, TIAN Chang

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110178, China

Abstract:ZA27 alloy was produced under super high pressure. The remarkable changes of crystal structure and microstructure were analyzed by XRD and metallography microscopy. The results show that the interplanar crystal spacing and lattice index of Al-rich α phase reduce gradually with increasing pressure. When the pressure reaches from common pressure to 5 GPa , Al-rich α phase lies on the (200) and (220) crystal faces, the interplanar crystal spacing are reduced by 1.07% and 1.15%. From common pressure to 3 GPa , the microstructure of ZA27 alloy changes from thick dendrites to fine dendrites, and finally to granular. According to the effect of solute diffusion coefficient under super high pressure and the calculation of Scherrer formula, it can be seen that the crystal organization is fine within the bounds of certain pressure. This conclusion is consistent with the experiment results.

 

Key words: super-high pressure; ZA27 alloy; crystal structure; grain organization

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

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

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