Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第7期    总第268期    2021年7月

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文章编号:1004-0609(2021)-07-1717-09
铜对热等静压钨合金微观组织和力学性能的影响
王健宁,蔡青山,朱文谭,刘文胜,马运柱

(中南大学 轻质高强结构材料国家级重点实验室,长沙 410083)

摘 要: 采用热等静压技术(HIP)制备90W-Ni-Fe-Cu合金,并通过SEM、TEM、EDS、EPMA和拉伸实验研究了铜对其微观组织和力学性能的影响。结果表明:随着铜含量的增加,合金烧结温度逐渐降低,实现了90W-Ni-Fe-Cu合金由固相烧结向液相烧结的转变。随着铜含量的增加,热等静压90W-Ni-Fe-Cu合金的拉伸强度和伸长率先增大后减小。铜含量为4%时,球形钨晶粒与γ黏结相均匀分布,拉伸强度和伸长率综合性能最优,分别为953MPa和7.65%,合金断裂方式主要由大量的钨解理断裂和黏结相延性撕裂组成;而当铜含量继续增加到6%时,由于铜对钨在黏结相中的溶解析出被抑制,γ黏结相中的钨含量降低,同时,高的静水压力将液相从钨晶粒间挤出,造成合金综合性能下降。

 

关键字: 钨合金;铜添加;热等静压;低温烧结;微观组织;力学性能

Effects of Cu on structure and properties of HIPed 90W-Ni-Fe-Cu tungsten heavy alloys
WANG Jian-ning, CAI Qing-shan, ZHU Wen-tan, LIU Wen-sheng, MA Yun-zhu

National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha 410083, China

Abstract:The 90W-Ni-Fe-Cu alloy was fabricated by hot isostatic pressing. The effects of Cu content on the microstructure and mechanical properties of 90W-7Ni-3Fe alloy were systematically investigated by SEM, TEM, EDS, EPMA and universal mechanical testing machine. The results indicate that, with Cu content increasing, the sintering temperature of 90W-7Ni-3Fe alloy decreases and the microstructure changes from solid phase sintering to liquid phase sintering. The tensile strength and elongation of 90W-Ni-Fe-Cu alloy firstly increase and then decrease with the increase of Cu. When the Cu content reaches up to 4% (mass fraction), the spherical tungsten grain and matrix phase are uniformly distributed, therefore the optimistic tensile strength and elongation (953 MPa and 7.65%, respectively) can be obtained. Its fracture mode is mainly composed of W cleavages and matrix ductile tearing. However, when the Cu content further increases to 6% (mass fraction), its mechanical properties decrease, which attributes to two reasons. Firstly, the solubility of W in γ phase decreases due to the increase of Cu, therefore, the solution strengthen of W to γ matrix phase is weakened. Secondly, the liquid phase is extruded by hydrostatic pressure during sintering process, which resulting the inhomogeneous microstructure.

 

Key words: tungsten heavy alloy; copper addition; hot isostatic pressing (HIP); low-temperature sinter; microstructure; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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