微量Zr與冷加工對Al-4.7Zn-1.6Mg合金淬火敏感性之影響;Effect of Minor Zr and Cold Working on Quenching Sensitivity of Al-4.7Zn-1.6Mg Alloys

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Title:	微量Zr與冷加工對Al-4.7Zn-1.6Mg合金淬火敏感性之影響;Effect of Minor Zr and Cold Working on Quenching Sensitivity of Al-4.7Zn-1.6Mg Alloys
Authors:	黎諺燊;Li, Yan-Shen
Contributors:	材料科學與工程研究所
Keywords:	Al-4.7Zn-1.6Mg合金;冷加工;固溶處理;淬火敏感性;Al-4.7Zn-1.6Mg alloy;cold working;solution treatment;quenching sensitivity
Date:	2017-07-28
Issue Date:	2017-10-27 13:17:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	藉由微結構觀察、DSC(Differential Scanning Calorimetry)量測與端面淬火測試(Jominy End Quench Test)等，探討微量Zr 與冷加工對 Al4.7Zn1.6Mg 合金淬火敏感性之影響。結果顯示，Zr 元素可有效抑制淬火敏感性的上升；冷加工則使Al4.6Zn1.6Mg(0.1Zr)合金淬火敏感性上升。Al4.6Zn1.6Mg0.1Zr 合金經過冷加工後，因再結晶驅動力較大，新晶粒中的Al3Zr 相失去整合性成為一異質成核點，故淬火敏感性較熱加工之Al4.7Zn1.6Mg0.1Zr 合金大。長時間的固溶處理對熱加工之Al4.7Zn1.6Mg 合金無較大影響，然而可使冷加工之Al4.7Zn1.6Mg 合金的晶粒成長，減少晶界，使其淬火敏感性稍微下降；長時間固溶處理使Al4.7Zn1.6Mg0.1Zr 合金之再結晶比例增加，穩定態相異質析出量上升，然熱加工之 Al4.7Zn1.6Mg0.1Zr 合金的穩定態相異質析出量對端面淬火試驗空冷端之硬度值影響較不明顯，冷加工之Al4.7Zn1.6Mg0.1Zr 合金的穩定態相異質析出量對端面淬火試驗空冷端之硬度值影響較大。;We investigate the effect of minor Zr and cold working on quenching sensitivity of Al4.7Zn1.6Mg alloy by microstructure observing, DSC measurement and Jominy End Quench Test, and so on. The result shows that Zr element can inhibit quenching sensitivity significantly, while cold working make quenching sensitivity of Al4.6Zn1.6Mg(0.1Zr) obviously. Recrystallization motivation of cold worked Al4.6Zn1.6Mg0.1Zr alloy is larger than hot extruded one and there are many low coherency Al3Zr particles as heterogeneous nucleation sites in the new grains, so the quenching sensitivity of cold worked alloy is more than hot worked one. Longterm solution treatment has no certain impact on hot worked Al4.6Zn1.6Mg alloy, but make average grain size of cold worked Al4.6Zn1.6Mg alloy growth, reduce the grain boundary area and lower quenching sensitivity of cold worked Al4.6Zn1.6Mg alloy slightly. Longterm solution treatment enhance recrystallization fraction of Al4.6Zn1.6Mg0.1Zr alloy, and increase the amount of precipitation of stable  phase. The amount of precipitation of stable  phase influence hardness ineffectively in the air cooling end of Jominy End Quench test tube of hot worked Al4.6Zn1.6Mg0.1Zr alloy, but effectively for cold worked Al4.6Zn1.6Mg0.1Zr alloy.
Appears in Collections:	[Institute of Materials Science and Engineering] Electronic Thesis & Dissertation

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