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氧含量及過熱度對(duì)鑄態(tài)Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5大體積玻璃合金微觀組織結(jié)構(gòu)及力學(xué)性能的影響
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Effect of Oxygen Impurity and Overheating on Microstructure and Mechanical Properties of As-cast Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5 Bulky Glass Alloys
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    摘要:

    利用射流成型法制備了厚度為２ｍｍ的Ｚｒ５２．５Ｃｕ１７．９Ｎｉ１４．６Ａｌ１０Ｔｉ５金屬玻璃薄板，通過控制氧含量和過熱度來改變 玻璃薄板中淬態(tài)結(jié)晶相的體積分?jǐn)?shù)。研究表明：低的氧含量水平和高的過熱度有利于提高該合金的玻璃形成能力，形 成完全非晶的合金；完全非晶的 ２ｍｍＺｒ５２．５Ｃｕ１７．９Ｎｉ１４．６Ａｌ１０Ｔｉ５大體積金屬玻璃薄板其斷裂應(yīng)力為 １７１０ＭＰＳ，彈性模量為 ８０ＧＰａ，彈塑性為２．２％。提高合金中的氧含量水平或者降低熔體過熱度都有利于結(jié)晶相析出?；w中出現(xiàn)２％和６％的結(jié)晶相時(shí)，斷裂應(yīng)力分別降為１５８ＭＰａ和１２２０ＭＰａ．淬態(tài)結(jié)晶相的析出改變了Ｚｒ５２．５Ｃｕ１７．９Ｎｉ１４．６Ａｌ１０Ｔｉ５大體積金屬玻 璃剪切流變的變形方式，使材料脆斷。

    Abstract:

    Zr52. 5Cu17. 9Ni14.6Al1.0Ti5 bulky glass sheets with thickness of 2mm were prepared by a water-cooled copper mold casting. The volume fraction of quenched-in crystallines were controlled by changing oxygen impurity content and overheating level. The results show: low oxygen content and enough large overheating level can improve the glass formation ability of the present ahoy. Fully amorphous sheet with a thickness of 2mm displays high fractured strength (1 710MPa). Samples with volume fraction of 2% still have high fractured strength (1 580MPa), but that of samples with volume fraction of 7% reduce rapidly to 1 220MPa. The reason for decreasing of fracture strength is that quenched-in crystals embedded on the amorphous matrix induce initiation and propagation of crack.

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邊贊,何國(guó),陳國(guó)良.氧含量及過熱度對(duì)鑄態(tài)Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5大體積玻璃合金微觀組織結(jié)構(gòu)及力學(xué)性能的影響[J].稀有金屬材料與工程,2001,(3).[Bian Zan, He Guo, Chen Guoliang. Effect of Oxygen Impurity and Overheating on Microstructure and Mechanical Properties of As-cast Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5 Bulky Glass Alloys[J]. Rare Metal Materials and Engineering,2001,(3).]
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