共查询到20条相似文献,搜索用时 8 毫秒
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试验研究了合金元素的不同添加方式对TZM合金的组织和性能的影响,最终确定了合金元素的合理添加方式。本文着重研究了TZM合金在不同温度下的抗拉强度和再结晶温度,通过与纯钼相比较,得出TZM合金优异的高温性能,并研究分析了不同合金元素的强化机理。 相似文献
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《粉末冶金学》2013,56(20):174-191
AbstractTwo series of tungsten-rhenium-osmium alloys have been successfully prepared by powder-metallurgy techniques in sintered bar form. The first series, containing nominally 5% Re and up to 2·25% Os, are single-phase alloys consisting of an α solid solution of tungsten, rhenium, and osmium. The second series, containing nominally 26% Re and up to 11·3% Os, consist of the same solid solution up to ~1·67% Os, the higher osmium contents giving a two-phase alloy consisting of the α solid solution and the hard, brittle a phase. The two-phase alloys are of the age hardenable type and their properties are thus dependent on the thermal history.The alloys containing ~26% Re and between ~0·69% and 4·5% Os are particularly prone to deformation twinning at room temperature, the tendency reaching a maximum at ~1·67% Os. This observation may be interpreted as an extension of the rhenium alloying effect, the double addition of rhenium and osmium giving an interactive as well as additive effect of Os atoms. Confirmation of the lower energy of the twinning planes is also apparent from the mode of precipitation of the σ phase on preferential planes in this composition range. 相似文献
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《粉末冶金学》2013,56(35):32-46
AbstractThe fabrication of dispersion-strengthened copper-glass alloys is described and the effect of Cu2O and Ti as adherence promoters evaluated. An unusual particle size effect has been observed, and a particle/void interaction model is proposed to account for this behaviour. 相似文献
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铜系合金引线框架材料的生产、发展和国产化 总被引:11,自引:1,他引:10
龚寿鹏 《有色金属材料与工程》1998,(2)
引线框架是集成电路的重要插件材料,随着电于信息技术的迅速发展,对引线框架材料提出了更高的要求。本文就铜系合金引线框架材料的生产、发展和国产化进程作一论述。 相似文献
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《粉末冶金学》2013,56(10):119-131
AbstractDispersion-strengthened lead-copper and lead-aluminium alloys have been prepared by atomizing the alloys from a temperature at which the copper or aluminium was dissolved in the liquid lead. The particles of the resultant powders consisted of a very fine dispersion of a second phase in a lead matrix. The powders were compacted and extruded. The mechanical properties of the extrusions at room and elevated temperature have been determined and their microstructure examined.At room temperature the alloys had a combination of tensile strength and ductility superior to most other lead alloys, including lead alloys strengthened by a dispersion of lead oxide. The strength of the leadcopper alloys increased with increasing copper content; this was attributed to the closer spacing of the,dispersed copper particles in the extrusions.The creep of the alloys was investigated at room and at elevated temperatures up to 100°C. Lead-aluminium alloys containing 0·55% aluminium had steady-state creep rates of < 1%/year at stresses up to 2500 lb/in2 at 25°C and up to 1200 lb/in2 at 100°C. The creep-resistance of the lead-copper alloys was somewhat lower. Their steady-state creep rate at low stresses was proportional to the applied stress, while at high stresses it was proportional to the fourth power of the stress. 相似文献
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研究了Fe-P-C-Cu-Mo系铁基粉末冶金材料中合金元素、烧结温度对合金组织及性能的影响,以及不同回火温度下磷的分布及其对合金断裂方式的影响。
通过研究得出:Fe-0.60%P-0-44%C-1.0%Cu-0.50%Mo合金在1160-1240℃烧结,保温1-2小时,可以获得较好的性能;若进一步经过850-900℃淬火,200℃或600℃回火,则合金的综合机械性能可以显著提高。通过试验发现:合金在200℃回火后,固溶在基体中的铝能抑制磷向晶界偏聚,使合垒断裂时呈现为穿晶断裂;400℃回火后,由于钼以碳化物形式析出,磷主要偏聚在晶界,造成合金沿晶断裂;600℃回火后,磷主要偏聚在孔隙表面,合金断口呈韧窝状。 相似文献
通过研究得出:Fe-0.60%P-0-44%C-1.0%Cu-0.50%Mo合金在1160-1240℃烧结,保温1-2小时,可以获得较好的性能;若进一步经过850-900℃淬火,200℃或600℃回火,则合金的综合机械性能可以显著提高。通过试验发现:合金在200℃回火后,固溶在基体中的铝能抑制磷向晶界偏聚,使合垒断裂时呈现为穿晶断裂;400℃回火后,由于钼以碳化物形式析出,磷主要偏聚在晶界,造成合金沿晶断裂;600℃回火后,磷主要偏聚在孔隙表面,合金断口呈韧窝状。 相似文献
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用Ti,Al元素混合粉(Ti-34%Al,Ti中含有1.5%TiC,质量分数),采用热等静压技术制备了TiAl合金,研究了热等静压压力对合金的密度,合金的微观结构以及物相等的影响,研究结果表明:随着热等静压压力的升高,合金的密度迅速增大,同时,合金中的Ti_3Al相消失,TiC与其它物质反应并在晶界处形成Ti_2Al相,随着压力的升高,合金收缩率的增大,细小的球状Ti_2AlC相会聚集在一起而变成针状Ti_2AlC,利用HIP技术可以很容易地制备出含C的TiAl复合材料。 相似文献
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添加Y合金化、配制AlCrYZr合金,采用金相、X射线衍射、透射电镜、扫描电镜、力学拉伸实验等研究手段,研究了快速凝固AlCrYZr合金粉末挤压成形工艺以及其对组织性能的影响。结果表明,实验合金中主要第二相为Al20Cr2Y(立方,a=1.44nm)和Al3Zr;挤压成形时提高挤压比,降低挤压温度,有利于改善粉体结合状况,得到Ll2Al3Zr质点,同时细化Al20Cr2Y质点,使合金获得动态回复组织,从而使合金具有良好的低温、高温强度和塑性。 相似文献
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