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Gd含量對Zr48-xCu45Al7Gdx非晶形成能力與力學性能的影響
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國家自然科學基金 (51165016)


Effect of Gadolinium Content on the Glass-Forming Ability and Mechanical Properties of Zr48－xCu45Al7Gdx Bulk Metallic Glasses
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    摘要:

    采用高真空電弧熔煉噴射成形法制備Zr48－xCu45Al7Gdx(x=0~7)大塊非晶。利用X射線衍射儀、差示掃描量熱儀、掃描電子顯微鏡、壓縮試驗和硬度試驗分別研究Gd含量對合金非晶形成能力，組織形貌與斷口形貌和力學性能的影響。結(jié)果表明，Gd含量對合金系的非晶形成能力和力學性能有顯著影響，Gd含量為(2~5)at%時，可制得直徑4 mm大塊非晶，非晶合金具有較大過冷液相區(qū)ΔTx(73~79 K)，約化玻璃轉(zhuǎn)變溫度Trg(0.694~0.698)。合金由無特征非晶組織構(gòu)成，抗壓強度σb為1768~1794 MPa，HV硬度為5.08~5.32 GPa。壓縮試驗中，試樣以純彈性變形方式發(fā)生脆性斷裂，斷口光滑平整，為典型脈絡狀花紋

    Abstract:

    Zr48－xCu45Al7Gdx(x=0~7) bulk metallic glasses (BMGs) were prepared by injection in copper mould with arc melting. The effect of Gd content on the glass-forming ability (GFA), microstructures, fractured surfaces and mechanical properties of the alloys were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscope (SEM), hardness tests and compression tests. Results show that Gd content has evident effect on the GFA and mechanical properties, the rod-shaped BMGs with 4mm diameter can be obtained at Gd content of (2~5) at%. The BMGs possess a larger supercooled liquid region ΔTx with value of 73~79 K and a better reduced glass transition temperature Trg with value of 0.694~0.698, which consists of only amorphous phases with compression strength σb of 1768~1794 MPa and Vickers hardness of 5.08~5.32 GPa. In compression test of the BMGs a brittle fracture happens in pure elastic deformation way, and all fractured surfaces are flat and smooth with typical vein-like morphologies

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王 遠,于曉華,劉 忠,張 玲,詹肇麟. Gd含量對Zr48-xCu45Al7Gdx非晶形成能力與力學性能的影響[J].稀有金屬材料與工程,2014,43(1):140~144.[Wang Yuan, Yu Xiaohua, Liu Zhong, Zhang Ling, Zhan Zhaolin. Effect of Gadolinium Content on the Glass-Forming Ability and Mechanical Properties of Zr48－xCu45Al7Gdx Bulk Metallic Glasses[J]. Rare Metal Materials and Engineering,2014,43(1):140~144.]
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  • 收稿日期:2013-01-22
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  • 在線發(fā)布日期: 2014-04-16
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