CAJ | 학술논문

以Al、K 2 TiF 6、KBF 4和Al-20Sr(质量分数，%)中间合金为原料，利用三步加料法和热挤压工艺制备Al-5Ti-1B-10Sr复合中间合金线材(d 9.5 mm)。该线材表面光滑，无气泡、起皮、裂纹等缺陷。组织结构分析表明：金属间化合物Al 4 Sr相为块状，平均长度为43.2μm，宽度为26.8μm，其内部或边缘存在许多孔洞和细缝； Al 3 Ti相呈颗粒状，平均直径为14.4μm；TiB 2颗粒非常细小，平均尺寸为1.42μm，其中95.77%为尺寸≤1.97μm以下的颗粒。将该复合中间合金应用于Al-13Si合金的细化与变质处理后，合金基体的α(Al)晶粒得到明显细化，共晶Si相也由粗大的针状组织转变成细小的纤维状或颗粒状结构；同时，Al-13Si合金的硬度提高43.2%，达到96.5HB，细化和变质效果明显。
이Al、K 2 TiF 6、KBF 4화Al-20Sr(질량분수，%)중간합금위원료，이용삼보가료법화열제압공예제비Al-5Ti-1B-10Sr복합중간합금선재(d 9.5 mm)。해선재표면광활，무기포、기피、렬문등결함。조직결구분석표명：금속간화합물Al 4 Sr상위괴상，평균장도위43.2μm，관도위26.8μm，기내부혹변연존재허다공동화세봉； Al 3 Ti상정과립상，평균직경위14.4μm；TiB 2과립비상세소，평균척촌위1.42μm，기중95.77%위척촌≤1.97μm이하적과립。장해복합중간합금응용우Al-13Si합금적세화여변질처리후，합금기체적α(Al)정립득도명현세화，공정Si상야유조대적침상조직전변성세소적섬유상혹과립상결구；동시，Al-13Si합금적경도제고43.2%，체도96.5HB，세화화변질효과명현。
The Al-5Ti-1B-10Sr master alloy wire (d 9.5 mm) was prepared by three-stage-feedstock method and hot extrusion process, with pure Al, K2TiF6, KBF4 and Al-20Sr master alloy (mass fraction,%) as raw materials. The wire surface is smooth, and without bubbles, peeling and cracks. The results show that, the Al 4 Sr phase is in the shape of block with many pores and cracks, and with an average size of 43.2 μm in length and 26.8 μm in width; the Al3Ti phase exhibits granular shapes with an average diameter of 14.4μm;the TiB2 phase is very fine with an average size of 1.42μm, and the percent of TiB 2 particles with size no larger than 1.97μm reaches 95.77%. When Al-5Ti-1B-10Sr is added into the Al-13Si alloy, not only the grain size ofα(Al) is significantly refined, but also the eutectic Si phase changes from the coarse acicular into fine fibrous or granular. Compared with the untreated Al-13Si alloy, the hardness increases by 43.2%after adding Al-5Ti-1B-10Sr, up to 96.5HB, showing a good performance of both refinement and modification.