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Synthesis and Industrial Trial of Non-Equilibrium Aluminum Alloys with a Combination of High Heat-Resistance, High Strength and Good Workability

高耐热、高强度、良好加工性的非平衡态铝合金的合成及工业试验

基本信息

批准号：
10555227
负责人：
KAWAMURA Yoshihito
金额：
$ 7.3万
依托单位：
Department of Engineering, Kumamoto University (2000-2001)Tohoku University (1998-1999)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

In order to develop novel elevated-temperature Aluminum alloys having a combination of high ambient-temperature strength of 600 Mpa, high elevated-temperature strength of 300 Mpa at 573 K, high heat resistance for 100 hr at 723 K, high workability and high wear resistance, we synthesized and investigated the mechanical properties of many Al-Ti-Cr-X rapidly solidified powder metallurgy alloys and their composites. Accordingly, we have succeeded in synthesizing Al_<92.5>Ti_<2.5>Fe_<2.5>Cr_<2.5> RS P/M alloy that reached our target of this study. The RS P/M alloy exhibited the following mechanical properties.(1) The alloy exhibited high tensile strength at ambient temperature. The tensile strength was ranging from 600 MPa to 660 MPa and the elongation was 3-4 %.(2) The alloy exhibited high tensile strength at elevated temperature. The tensile strength was 480 MPa, 320 MPa and 150 MPa at 473K, 573K and 673K, respectively.(3) The alloy exhibited high thermal stability. The decrease in ambient-temperature strength due to annealing at 723K for 100 hr and 623K for 1000 hr was within 10 %.(4) The alloy can be hot-worked at high strain-rate with keeping the high ambient-temperature strength of about 550 Mpa. The alloy exhibited a large elongation at high strain-rate of 10^<-1> to 1 s^<-1> at 823 K where the decease in ambient-temperature strength was within 15 % for 5 hr.(5) The composite with 2.5 vol% SiC particles exhibited improved the Young's modulus and the wear resistance at high temperature of 473 K.Some companies are trying tests of practical application of the Al_<92.5>Ti_<2.5>Fe_<2.5>Cr_<2.5> RS P/M alloy developed in this study.

为了开发兼具600 Mpa高常温强度、573 K 300 Mpa高高温强度、723 K 100小时高耐热性、高加工性和高耐磨性的新型高温铝合金，我们合成并研究了多种Al-Ti-Cr-X快凝粉末冶金合金及其力学性能。复合材料。据此，我们成功合成了Al_<92.5>Ti_<2.5>Fe_<2.5>Cr_<2.5>RS P/M合金，达到了本研究的目标。 RS P/M合金表现出以下力学性能：(1)该合金在常温下表现出较高的拉伸强度。抗拉强度为600~660 MPa,延伸率为3~4%。(2)合金在高温下表现出较高的抗拉强度。 473K、573K和673K时的拉伸强度分别为480 MPa、320 MPa和150 MPa。(3)合金表现出较高的热稳定性。 723K 100 hr和623K 1000 hr退火导致的常温强度下降幅度在10%以内。(4)该合金可进行高应变率热加工,同时保持约550 Mpa的高常温强度。该合金在823 K时在10^-1到1 s^-1>的高应变速率下表现出较大的伸长率，5小时内常温强度下降幅度在15%以内。(5)含有2.5 vol% SiC颗粒的复合材料在473 K高温下表现出改善的杨氏模量和耐磨性。一些公司正在尝试该材料的实际应用测试。 Al_<92.5>Ti_<2.5>Fe_<2.5>Cr_<2.5>RS P/M合金是本研究中开发的。