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95W-3.5Ni-1.5Fe合金高溫性能、組織及斷裂機(jī)制
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國家杰出青年科學(xué)基金（50925416）；國家自然科學(xué)基金創(chuàng)新群體項目（51021063）


Mechanical Properties, Microstructure and Fracture Mechanism of 95W-3.5Ni-1.5Fe Alloys at High Temperature
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    摘要:

    研究了95W-3.5Ni-1.5Fe合金在400~1100 ℃范圍內(nèi)的高溫拉伸力學(xué)性能及其斷口特征，并分析了其斷裂機(jī)制。結(jié)果表明：合金的抗拉強(qiáng)度及屈服強(qiáng)度均隨溫度升高而降低，延伸率和斷面收縮率隨溫度升高呈現(xiàn)先增加后降低的關(guān)系，600 ℃時延伸率和斷面收縮率達(dá)到最大值。對其斷口分析結(jié)果表明：在400~600 ℃范圍內(nèi)，由于鎢相發(fā)生了塑脆轉(zhuǎn)變，鎢顆粒塑性提高使得兩相協(xié)調(diào)變形能力增強(qiáng)，合金塑性提高。而當(dāng)溫度升高到700 ℃以上，粘結(jié)相發(fā)生動態(tài)再結(jié)晶軟化，鎢相和粘結(jié)相界面結(jié)合強(qiáng)度大幅度下降，外加應(yīng)力不能由粘接相傳遞到鎢顆粒，其兩相協(xié)調(diào)變形能力變差，導(dǎo)致合金強(qiáng)韌性急劇下降。

    Abstract:

    The mechanical properties and fracture characteristics of 95W-3.5Ni-1.5Fe alloys were investigated by tension in the temperature range of 400-1100 oC and the fracture mechanism was analyzed. The results show that the ultimate tensile strength (UTS) and the yield strength of the alloy decrease with the increasing temperature, while the elongation and the reduction of fracture surface area firstly increase up to the maximum value at 600 oC and then decrease with the increasing temperature. The improved ductility of the alloys in the temperature range of 400-600 oC is due to the enhanced comparable deformation capacity between tungsten and the matrix phases by ductile-brittle transformation of tungsten phase. Above 700 oC, dynamic recrystallization occurs in the matrix, which deteriorates the strength of tungsten/matrix interfaces. Hence, the applied stress can not be transited from the matrix to tungsten particles and the comparable deformation capacity of tungsten and matrix is reduced, resulting in a sharp decrease in strength and toughness of alloys.

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范景蓮,丁 飛,曾 毅,龔 星,劉 濤,田家敏.95W-3.5Ni-1.5Fe合金高溫性能、組織及斷裂機(jī)制[J].稀有金屬材料與工程,2011,40(12):2121~2124.[Fan Jinglian, Ding Fei, Zeng Yi, Gong Xing, Liu Tao, Tian Jiamin. Mechanical Properties, Microstructure and Fracture Mechanism of 95W-3.5Ni-1.5Fe Alloys at High Temperature[J]. Rare Metal Materials and Engineering,2011,40(12):2121~2124.]
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  • 收稿日期:2010-12-21
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