(沈陽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，沈陽 110178)
摘 要: 采用高機(jī)械壓力方法制備ZA27合金試樣，通過X射線和金相分析手段研究晶體結(jié)構(gòu)與組織變化。結(jié)果表明：隨著壓力的增加，晶面間距和晶格常數(shù)都逐漸減小，當(dāng)壓力達(dá)到5 GPa時(shí)，富鋁α相在(200)與(220)晶面 處，晶面間距較常壓力時(shí)的分別減小1.07%和1.15%；在常壓至3 GPa范圍內(nèi)，晶粒由粗大的樹枝晶→細(xì)小的樹枝晶→粒狀、橢球狀枝晶轉(zhuǎn)變的趨勢，通過壓力對合金凝固溶質(zhì)擴(kuò)散系數(shù)的影響結(jié)合Scherrer公式計(jì)算分析其組織變化原因，得出在一定的壓力范圍內(nèi)，隨著壓力的增大，晶粒尺寸逐漸變小，這一結(jié)論與實(shí)驗(yàn)結(jié)果相符。
關(guān)鍵字: 超高壓；ZA27合金；晶體結(jié)構(gòu)；晶粒組織
（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
