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擠壓態(tài)噴射成形Mg12Al1.5Zn6.5Ca1Nd鎂合金組織及力學(xué)性能
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教育部春暉計劃項目 (2011061); 內(nèi)蒙古自治區(qū)自然科學(xué)基金 (2013MS0801)


Microstructure and Mechanical Properties of As-extruded Spray Forming Mg12Al1.5Zn6.5Ca1Nd Alloy
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    摘要:

    利用噴射成形技術(shù)制備了Mg12Al1.5Zn6.5Ca1Nd鎂合金，采用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)等測試手段，研究了擠壓態(tài)實驗合金的微觀組織及力學(xué)性能。結(jié)果表明: 擠壓態(tài)實驗合金組織主要由α-Mg和Al2Ca組成，合金組織為等軸晶，晶粒大小約為2 μm, 第二相Al2Ca顆粒主要彌散分布在晶界處，顆粒平均尺寸小于1 μm; 基體內(nèi)存在位錯網(wǎng)及位錯塞積，Al2Ca相中存在孿晶結(jié)構(gòu)；合金抗拉強度(σb)、屈服強度(σ0.2)、延伸率(δ)分別為470 MPa、350 MPa、4.7%，主要強化方式為細晶強化、彌散強化、固溶強化；斷口存在微孔聚合形成的孔洞，孔洞底部的雜質(zhì)相或孔洞周圍硬脆相與基體之間易萌生微裂紋，合金斷裂機制為微孔聚合型沿晶斷裂

    Abstract:

    The Mg12Al1.5Zn6.5Ca1Nd alloy was prepared by spray forming. The microstructure and mechanical properties of the as-extruded experimental alloy were investigated by XRD, SEM, TEM and EDS. The results show that the microstructure of the experimental alloy consists of α-Mg and Al2Ca, the microstructure is equiaxial grain, and the grain size is about 2 μm. The size of dispersive Al2Ca phase is less than 1 μm, which distributes mainly along the grain boundaries of the primary Mg. The dislocation pile-up in matrix Mg and twin structure in Al2Ca are observed by TEM. The σb, σ0.2 and δ of the alloy reach 470 MPa, 350 MPa and 4.7%, respectively. The main strengthening methods are fine grain strengthening, dispersion strengthening and solid solution strengthening. The fracture morphologies indicate the micro cracks nucleate between the impurity at the bottom of holes or the hard phase around the holes and the matrix. Holes are formed through micropores aggregation in the fracture. The fracture mechanism is microporous polymeric intergranular fracture

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崔曉明,白樸存,侯小虎,董銀元,陳 偉.擠壓態(tài)噴射成形Mg12Al1.5Zn6.5Ca1Nd鎂合金組織及力學(xué)性能[J].稀有金屬材料與工程,2014,43(9):2281~2284.[Cui Xiaoming, Bai Pucun, Hou Xiaohu, Dong Yinyuan, Chen Wei. Microstructure and Mechanical Properties of As-extruded Spray Forming Mg12Al1.5Zn6.5Ca1Nd Alloy[J]. Rare Metal Materials and Engineering,2014,43(9):2281~2284.]
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  • 收稿日期:2013-09-19
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  • 在線發(fā)布日期: 2015-02-25
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